Alondite has the benefit of being tied to only armor units, so the refine can work with that, similar to how Maltet got an armorbuster immunity effect. I wouldn't be surprised if Alondite got the same thing, and better still, a Save effect, since that is what BK did over and over in Radiant Dawn. It would also combo well with Zelgius's Warp Powder, to make sure he's always in range to go Saving. At that point he'd just be missing some self-sustain, to keep Powder active, but Alondite could even get *that* too, Bellringer style.
Gradivus can be used for a full heal in Archanea, so making it like Sol Lance is not impossible. They could take it further than Sol Lance too, and heal for 25% of their HP per hit, and heal for 11 at minimum investment then.
Ragnell's on two Infantry units, and Priam would be on foot as well if he ever shows up, so giving it Infantry skills works. Time Pulse, Ideal, NFU, NCD, all that jazz.
Siegfried, horse unit only. Canto that sucker.