I wouldn't try holding the var with a long screwdriver. Remember Axy tried that and broke fins off and wound up getting a holding tool anyway. I'm sure others have done the same. Only hope of that is if the last mechanic put it back really loose and I wouldn't count on that.
The wood block I mentioned was for wedging the holding tool against. That is I figure you could use wood instead of the angle iron I use.
As for the clutch, I don't see getting it off without a holding tool or impact wrench. Once you get it off, then you need either another special tool (clutch compressor) or some really big C clamps and some nerve and time to get the clutch off the driven pulley. Getting the outer nut off gets the bell off and lets you take off the clutch/driven pulley as a unit. Do you know yet if you MUST replace the clutch torque spring? Or the clutch springs themselves? To do either you have to take clutch completely off.
If the torque spring is replaced with a stronger or longer spring, then your rpms will go up for some or all of the speed range. That is unless the malossi var is geared to compensate which it may be, I don't know. Also a longer/stronger torque spring will put more stress/tension on the belt and variator -- again, unless the var is engineered to compensate. It may be that a malossi belt is actually longer than stock which would compensate. That could also explain why some people have had malossi belts break -- that is they may have used the belt without the variator install. Lots of things to think about.
But don't let that stop you Sissy! We'll help get you through this!
Just to inspect the clutch you only need take off the outermost nut, spacer, and bell. Now that I think about it, you might not even need to do that. Might could just shine a flashlight through the slots in the bell.