That sounds legit. Although I'm not sure if I'd prefer it to be another fast b-class (like raider), or have it be a truly beefy fat b-class (Kinda like how vanguard and g2r are relatively delicate c-classes). Also, I'm sure many would have qualms over putting the breacher on anything other than Pred.
I expect people will object to breacher. I suggested on a C-class concept and have had people criticise having breacher as an option.
But really, is there any reason it should only be on Predator? other than Pred pilots will be all butthurt by it?
Theres a reason you'd only have the bear miniguns on incinerator (and perhaps redox on tech), but reflak on raider?, seeker on rocketeer? PN223 on tech?
They could be used on other mechs if balance is kept in mind.