I've got a Mu SL11 bike new in box. Came with a QR skewer puncturing the box so a bit scratched.

My thought is you could have a alternative wheel-tire setup with your rims. A bigger tire with a wider range cassette on your rims while standard set would be small and fast

MU SL10s are also prospects. Mu Rohloff and MU Unos also avail on a limited basis. Misses what sort of axles you have in those wheels.

Something will suit those wheels.