I regard to what stanchions to use with clamped yokes I would think most 35mm stanchion from Japanese or European origin, along with their damping, could be fitted into standard Norton sliders. I've certainly seen this done with 35mm Suzuki legs and dampers. It required machining up new bushes, but from memory everything else was straightforward.
or the option of bolting on the full fork/wheel brake package,
doesn't take much to go with pinch bolt yokes if desired, or other bigger fork packages
https://www.caferacer.net/forum/project-builds/14059-triple-tree-fork-conversion-chart.html
35 MM FORKS BY MANUFACTURER
Harley 35MM
35 Harley XLH, XLCH, XLRC 1975-83; XLX & XLS 1983 only 35 mm
35 Harley XLS 1979-82 (Showa Forks) 35 mm
35 Harley
Sportster with Showa forks from late 1986-87 35 mm Coarse Thread
35 Harley Sportster 1984-E86 35 mm Fine Thread
35 Harley FX & FXE 1973-76 (Kayaba Forks) 35 mm
35 Harley FX, FXE& FXEF (Showa Forks) 1976-83 35 mm
35 Harley FXS, FXB, FXSB, FXR & FXRS 1977-83 (Showa Forks) 35 mm
35 Harley FXRT & FXRD 1983-86; FXSB 1984-85; FXRS Sport Edition 1985-86 35 mm
35 Harley FXE & FXEF 1984-85; FXR 1984-86 (except FXRT, FXRD & Sport Edition) 35 mm Fine Thread
35 Harley FXR (except FXRD, FXRT & Sport Edition) with Showa forks from late 1986-87 35 mm Coarse Thread
35 Harley FXRT with Showa Fork 1987 only 35 mm
35 Harley Sportster 1973-74 (Kayaba Forks) 35 mm
Honda 35MM
35 Honda CR-80R (87-95)
35 Honda CR-125M "Elsinore" (76)
35 Honda CR-125M "Elsinore" (77-78)
35 Honda NX-125 (88-90)
35 Honda XR-200R (81-83)
35 Honda CL72 "Scrambler 250"
35 Honda CR-250M/M1 "Elsinore" (73, 75-76)
35 Honda MR-250 "Elsinore" (76)
35 Honda VTR-250 "Interceptor VTR" (88-90)
35 Honda XL-250 "Motosport 250" (72, 74-76)
35 Honda XL-250S (78-80 To 5204066)
35 Honda XL-250S (80 From 5204067 - 81)
35 Honda XR-250 (79-80)
35 Honda CL77 "Scrambler 305"
35 Honda SL-350 "Motosport 350" (72)
35 Honda XL-350 (74-78)
35 Honda CL-450 "Scrambler" (69-72)
35 Honda CB-450 (70-74)
35 Honda CB-500 "500 Four" (71-73)
35 Honda CX-500C "Custom" (81-82)
35 Honda GB-500 (89-90)
35 Honda GL-500/I (81-82)
35 Honda XL-500S (79-80 To 5104835)
35 Honda XL-500S (80- 81)
35 Honda CB-550 "550 Four K" (74-78)
35 Honda CB-650 (79-80)
35 Honda CB-650 (81-82)
35 Honda CB-650C (80 To 2009951)
35 Honda CB-750K (69)
35 Honda CB-750 "750 Four" (70, 72)
35 Honda CB-750A "750 Hondamatic" (76-78)
35 Honda CB-750C "Custom" (80-82)
35 Honda CB-750F "Super Sport" (75-78)
35 Honda CB-750F (79-80)
35 Honda CBX (79-80)
Kawasaki 35MM
35 Kawasaki KX-80 G1/G2 (86-87)
35 Kawasaki KX-80 L1-L3/N1-N3 (88-90)
35 Kawasaki KE-175D1-D4 (80-83)
35 Kawasaki EX-250E1/E2 "Ninja" (86-87)
35 Kawasaki KE-250B1-B3 (77-79)
35 Kawasaki KZ-550H1/H2 "GP" (82-83)
35 Kawasaki ZX-550A1-A3 "GPz" (84-86)
Suzuki 35MM
35 Suzuki RM-80 K/L/M/N/P (89-93)
35 Suzuki RM-80 R/S/T/V/W/X/Y/K1 (94-01)
35 Suzuki RM-100 N/T/X (79-81)
35 Suzuki DR-125 G/H/J (86-88)
35 Suzuki DR-125 SER/SES/SET (94-96)
35 Suzuki RM-125 M/A (75-76)
35 Suzuki SP-125 G/H/J (86-88)
35 Suzuki DR-200 G/H/J (86-88)
35 Suzuki DR-200 SET/SEV/SEW/SEX/SEY/SEK1/SEK2/SK3 (96-03)
35 Suzuki RL-250 L/M "Exacta" (74-75)
35 Suzuki SP-250 Z/D/F (82-83, 85)
35 Suzuki TS-250 1 "Savage" (69)
35 Suzuki TS-250 B/C/N (77-79)
35 Suzuki GN-400 T/XT/XX/TX/TZ (80-82)
35 Suzuki TM-400 K/L/M "Cyclone" (73-75)
35 Suzuki GS-450 LD (83)
35 Suzuki GS-450 LF/LG/LH/LJ (85-88)
35 Suzuki GT-500 A/B "Titan" (76-77)
35 Suzuki RE-5M, A
35 Suzuki GS-550 LX/ LZ (81-82)
35 Suzuki GS-550 B/C/EC (77-78)
35 Suzuki GS-550 LN/LT (79-80)
35 Suzuki GS-550 LG (86)
35 Suzuki GT-550 J/K "Indy" (72-73)
35 Suzuki GT-550 K (KAYABA)/ L (73-74)
35 Suzuki GR-650 D/XD "Tempter" (83)
35 Suzuki GS-650 EX/EZ(81-82)
35 Suzuki GS-650 GLX/GLZ/GLD(81-83)
35 Suzuki GS-750 B/C/EC (77-78)
35 Suzuki GS-750 EX/EZ (81-82)
35 Suzuki GS-750 LT/LX (80-81)
35 Suzuki GS-750 TZ/TD (82-83)
35 Suzuki GT-750 J/K/L/M/A/B "Lemans" (72-77)
Yamaha 35MM
35 Yamaha YZ-100 G/H (80-81)
35 Yamaha IT-125 H (81)
35 Yamaha RT-180A/B/C (90-93)
35 Yamaha XT-200 J/K/KC (82-83)
35 Yamaha XT-250 G/H/J/K/KC (80-83)
35 Yamaha TZ-250 C/D/E (76-78)
35 Yamaha TZ-250 F (79)
35 Yamaha RZ-350 L/N/NC/NCII (84-85)
35 Yamaha TZ-350 /C/D/E (72-78)
35 Yamaha XS-400 J/K "Maxim" (82-83)
35 Yamaha SR-500 E/F/G/H (78-81)
35 Yamaha XS-500 C/D/E (76-78)
35 Yamaha XJ-550 RH/RJ/RK "Seca" (81-83)
35 Yamaha XZ-550 RJ/RK "Vision" (82-83)
35 Yamaha XS-650 D/E/F/2F (77-79)
35 Yamaha XS-650 SE/SF/SG/SH/SJ (78-82)
35 Yamaha TX-750/A (73-74)
35 Yamaha XS-750 D (77)