I'm thinking the position of his saddles isn't the problem per se, the position of the grooves in them is - and the grooves can be moved/altered easy-peasy with a triangular file, taking more off the side toward the direction he needs to go. That and the holes in the end of bridge which are definitely too close together - that should probably be attended to first so the strings quit getting a bow in them between saddles and end.. With the saddle grooves and the end plate holes lined up there is no need for grooves for the set screws.What you could do (although it would be extremely cumbersome for no functional gain), is figure out where the saddles should be (they can be shifted slightly side-to-side) and file some grooves for the set screws, like you can see here:
I'd agree that bridge was the wrong one for that bass - probably 1mm closer spacing than original.
Time to take that bass out back and shoot it. It's suffered enough.

