HOLY CHIT.... Thats the exact issue I have on the Sporty this week. Took the forks off to polish the lower legs as the OEM clearcoat was cactus and the weather seals were all rusted out as well. Tried to remove those bloody bolts and they are now both fucked and will need to be drilled out just like you are doing. I gave up as i wanted to ride the bike so put it all back together for a winter project if i get motivated.