1) See MPH 648 for an article by Neville Higgins on moving cams within camwheels. Not advised for those of a sensitive disposition. Both shaft and pin will expand at the same rate, so don't heat.
2) Who knows? Suck it and see... but DO try to get sight of MPH 648, January 2003.
3) Silver steel ones should be hardened already, stainless ones work-harden, so in both cases the answer is no.
Older readers may skip this. If I were you, I would set the timing to equal lift at 4 deg before TDC. Even if I weren't you, I would certainly check that that's what I had if I'd timed them by any other method. And if I didn't have EL at 4BTDC, I'd go and make a cup of tea, and think about why not. While perusing MPH 648, p. 12, et seq.