RVL - Thanks. It does make sense there would be some "lingering" fuel/oil inside. I understand not ALL would be out of the carb, but almost certainly, highly unlikely with a "nearly" empty carb for any to come out over flow tubes.
Another option I thought of was to time approximately how long to stall - (actually, I loosely did, two of the 3 took about 1.5 minutes, the other about 2 minutes riding at a fairly slow putt putt around and around the garage. So if I were to let them all run for just short of those times - I would have minimized the amount fuel in float bowl, just short of stalling, eliminating any top end risk.
Yeah, I thought about just loosening the drain as well, but it is a rather awkward fit to get a wrench in there without loosening the clamps on the carb...and doing that, means a greater chance of somehow forgetting one is loose and sucking dirt in! This weekend I plan to take a closer look see to really see how easy i can or can not get to the drain on each of our bikes (05 KTM 250, 03 KTM 200 and 99 Kaw. KDX 200). Maybe all I need to do is ever so slightly reposition each carb such I can get to drain easily without rotating carb.