A LOT of things "can be done". A lot of things are not impossible. Does that mean it's realistic or smart to purposely go for it just because it's physically possible? I say not. You buy a bike you're not comfortable with, you're not going to ride as much, you're not going to enjoy as much.
Sure some people put the effort into parking lot practices but in reality most do not. Unless OP comes back and say, okay guys I've practiced my moves, I'm completely confident in tippy toeing one foot. I can move the bigger, taller bikes with full confidence and ability? Telling somebody they should just go for it is IMO no different than teller a new rider they can and should continue to look into litre crotch rockets because people have successfully learned on them and physicall can operate them.
To clarify, I'm not saying the previous advice OP was given was correct (too much of a blanket statement as 600cc bikes can very so much in size and performance).
Bundles, you need to provide a bit more info if you really want help. Sounds like you're looking for a super sport (gixxer, r6, etc.) but I see you've ridden a cruiser as well. Are you looking strictly for a supersport or open to other bikes as well? Are you looking only at 600cc or open to slightly higher/lower displacements? (say 500 or 800). Have you considered a lower or shaved seat or height-adding boots like the Daytona Ladystars (a $500 investment but little or no mods to the bike itself)