Yup, happened to a buddy with a Honda 650.... Seized up the cam on a long wheelie (Honda's do have very low oil pressure to the top end)... but yes it can happen!!
Monster trucks in their new "2 wheel" format can only go for 90 seconds before damage can occur... Knowing those guys, they just tested one until it locked up... I wouldn't recommend that approach with that beautiful Husky though.
There probably is way with an external electric pump to solve this, but it would take a lot of work, and maybe a little luck 😄... Do some research on Doug Demokas (the wheelie king), I know they did some mods on his stuff way back in the day!!
Thanks I've decided to stop doing long wheelies with this bike. I hope I didn't damage anything. The longest it was up was still less than a minute. I was thinking the clutch would have flung enough oil up into the pump area to keep the oil flowing but who knows? Guess I'll be on the lookout for a drz or maybe a 500exc