I'll try some good quality new ones first, but after that I think that would be the way to go.
The 15b-fte is rated at 118kw@3200 and 382nm@1800, compared to a 1hdfte(ute) with 122kw@3400 and 380nm, I reckon they'd push an 80 around pretty well (The 15b-ft is probably slightly less, can't seem...