Between Jansen, Kirk and Varsho catching should be covered, no need for any of them to catch even 80 games if they are worried about wear and tear. If one of them gets hurt then you probably just have to deal with having a s***** backup catcher for a while, like basically every other team in baseball does every day. We've got a few in Buffalo like Chris Bec and Stevie Berman who could fill that role, but hopefully it's not needed.
Also, Biggio is your lefty DH/1B/LF, but also 2B. Sure he's not Going to give you a 140 wRC+, but he should settle in in the 110 range with the shift outlawed, and he's likely only getting maybe 2 starts a week with this roster, if that.