Another option.. you could always get one with MX Brown or something and then get some MX Clears (or better yet, Zealios/Ergo-Clears) to replace them.
Indeed I could, in terms of complexity and skills required, is it difficult? Seems it's possible to unclip the top of the switch and replace just the spring?
The switches on an FC660M (and indeed most mechanical keyboards) are soldered into a PCB circuit board as well as mounted onto a plate. The plate prevents the tops of the switches from coming off.
Replacing just the stems/springs ends up being more work than just changing the switches outright since both procedures involve desoldering each switch and removing the switches from the plate.
It really isn't that difficult, and there are lots of people who can guide you through around here. It just takes some patience as there are quite a few solder points on the PCB that all need to be desoldered using a soldering iron and a desoldering stick (spring-loaded syringe-like device).