Replacement crank, missing locks

Just purchased a 1963 house in Eugene, OR and it has most of the old wooden casement windows. The wood is in good shape and the mechanisms are intact but many of the cranks are stripped. I would rather not replace the entire operator because there are many layers of paint and the install looks non standard.

Is there a separate crank and screw assembly that I can purchase alone?

Also one of the previous owners removed all the locks and patched the holes; there is no evidence of the style of lock remaining. The wood cover trim pieces have also been removed.

Can someone suggest a simple to install lock? Most of the original style locks involve adding the trim back and cutting holes in the wood. I see some sweep locks that might work but they look like the lock and sweep need to be on the same plane - mine will need to be 90° between the sweep and the keeper. I would rather not cut into the wood or have to add all the cover trim back.