No new switches from Cherry, no.
There's a Gateron brown switch with the same weight as Cherry MX brown. Some say that the Gaterons are smoother than the Cherries.
There's a Gaote brown, which is apparently similar to the MX brown.
The Kailh switches seem to all have stiffer springs.
Keycaps can be replaced on most keyboards - just make sure you get one with a standard layout, US ANSI if you use that layout.
Have you also considered backlighting? Although most backlight-friendly keycap sets are ABS, nevertheless they are eminently visible in low light conditions.