I like your idea of pushing down on the tank and just hand tightening and loosening the nuts.

As far as the rear tank strap goes, well I took mine off 17 years ago so do not bother with it, the tank is held quite secure in the rear by
my corbin seat.

I know this sounds terrible, and I havn't done it, but you could cut a slot in the back of each mounting hole so you can slip the mounting rubbers each side of the mount as required. The mounting rubbers I got supplied would be to hard to push down to do the nuts up, are some types quiet soft On an interstate you can notch the front side of the rear strap so you can push it into the stud on one end, already notched and then slip the other end in by pushing foward so you wouldn't have to remove the studs and rubbers, would work on a roadster to.

i have an idea-one could use a ratchet wrench to remove the 4 bolts/nuts in under 5 minutes and the fuel line with a screw driver in a minute -

brilliant!

Personally, I remove the fuel lines at the petcocks and leave them in place on the bike.

Regardless of the method, you'd STILL need a screwdriver (for hose clamps) or a wrench (for spigot nuts), unless you go "bare" as mcns suggests.