French (official I think?) MV stunt rider does them on an F3. Been posted on here a few months ago. Safe? For him maybe. I'd not have the skill or know where to start. Definitely end up worse for wear if I tried.
Nope a definite no! Like stated side stand on pre 2010 is mounted on sump, plus the angle on our kickstands is very steep so even more stress. I keep side stand deployed the least possible, always use paddock stand at home.
If you want my opinion, I'd also never ever do this, regardless of where the stand is mounted.
Under normal operation, the stand will never be subject to the full weight of the bike. Most of the weight is still on the tyres. The stand is only subject to relatively little weight produced by the slight offset of the bike's centre of gravity. I cant do the math, but if you want to do a real life test, try sitting on the bike and putting a leg down. Now keep leaning the bike and see when your knee pops
I wouldnt do it on ANY bike with an alloy stand. On a cruiser with a big honking steel stand maybe but those with alloy stands it usually says in the manual not even to be putting weight on the bike while on the stand. Sportbikes are made to be light, meaning some components are designed to be just as strong as required.