Wow how many times have you replaced it? In the 10 or so years I've used the 250 I think I've gone through 3 sets of pumps and maybe one additional set of impellers. You can convert it to a standard needle wheel. You will lose a tiny bit of efficiency but not much. When I ran the mesh wheels they occasionally needed a poke start ect.
I think the 200 uses the same pump as the 250 just one instead of 2. It's now the sicce psk 600 I'm pretty sure. The model numbers have changed a few times through the years but if you buy new pumps now they won't come with mesh. You can also buy just impellers but if your mesh is still working I say go for it. At least when I bought mine this was revolutionary and it was advertised as comparable performance to bubble kings which did not yet have the minis out so they were $1000s of dollars for their skimmers.