I'm curious, are you mandating that the indoor combat planes be "non tractor" designs (ie, prop in back like Zagi, or prop in middle like hyperflea?)

I think you'll find they're a lot more combat friendly because they don't inflict or receive as much damage due to prop strikes. The IFO is a special case due to the carbon loop bumper, but still manages to suck a lot of tail parts into the prop arc while attempting to combat. The lite flite bug also in that category and is feared similarly by other slow flyers.

Best yet would be a really light small EDF if you can find one that turns tight enough.