A lot of the electric flyers look at me like I am nuts when I say I prefer Glow. Slimer is one of the more polite terms I have heard used. I only recently got back into this hobby and when I got out (25 years ago) electric was almost unheard of and what was available was lousy. The smell of burning castor snaps me back to my youth and though I may someday use a gas engine I hope I never get tired of wiping down my airplanes. Having not looked too closely at the electric models for that very reason I would imagine not all of them would be suited to conversion. Several of the ones at the club are not covered in anything that remotely looks like it would be fuel proof.
I am not against electric planes and have actually considered a small one for indoor flight (long cold winters here!), but outside I like to hear my plane. Seems the first sign of trouble in an electric flight system is a smoke trail and the smell of melting foam.
All that said if the right model came along I would be all for converting it!

Cheers

Gord