Why not? But I'd check out an E-Bow, same/similar results, no mods necessary. Michael Manring uses it a lot. http://www.ebow.com/
You cannot install a guitar sustainer system onto a bass as far as I know. Fernandes used to make a bass version, but stopped selling them a while ago. Your best bet is to contact Fernandes themselves and ask them about it. They do make custom basses with it installed.
what about this? groove tubes: FATHEAD The simple way to get more sustain, overtones and balance from any guitar or this, the fatfinger
Barroso, how does that fatfinger piece work? Btw I have been searching for a sustain bridge for a while. You should speak with Michael Manring, he was using a prototype sustain bridge for his fretless.
Fathead.? Sounds like your talking about my brother. I thought that the "Fatfinger" was sold originally to help cure dead spots on the fingerboard by adding mass to the headstock. I suppose it could add sustain but I've never tried one personally. Could be wrong but it sounds like a brain fart to me. Best of Luck
http://www.sustainiac.com Maniac Music makes a Sustainiac model for bass. (FWIW, the Fernandes Sustainer is a reverse-engineered version of an older model of the Sustainiac.)
All I can say is it runs off 18v, and is kind of like taming a beast when its engaged, it's very versatile when it comes to sound, especially the harmonics of it, blows sustainiac out of the water too btw, I found out recently that it's just the driver that's been discontinued, a regular fernandes sustainer circuit will power it, same one they had in older guitar models. I just bought a gotoh 510br bridge I found on eBay, not gonna do any vids til that's equipped