He was signed to play 1B, DH was intended to be a rotation of players. Falvey stated this after the signing, which is what made this a bad signing. At least they have pivoted from this, but he is clogging up the DH spot. You could have gone with four starting outfielders and rotated one at the DH spot for example.
There was no market for Bell last year and his numbers are no better this year, so if they are not willing to DFA him, I am afraid he will be on this roster thru the end of the season.