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With the front wheel removed there's plenty of space to pull the slider off the fork tube with the bike on the center stand.  I have an early bike with the short center stand and the damper slider cleared easily on my version. I can't imagine the later model commando with the slightly taller center stand doesn't have more clearance than mine.

I did a modern high tech damper conversion to have dual circuit compression and rebound damping when I serviced my forks.  At the very least you should buy the improved "stock style" damper parts from Jim Schmitt because the stock norton damper parts are crude.  At least with Jim's parts you get a better fitting early design so you can tune the performance better than the stock parts even if you can only tune it with fluid viscosity choices...

Edited to add,... once you take the front wheel off the bike will be light weight up front and it will sit on the center stand and rear wheel.  I never secured it with straps. I was just careful not to bump it once the wheel was off.