Of course its possible. regular D2FC or D2f-01f switches should make it feel lighter. If you're feeling experimental, Zippy DF3 should be even lighter.
Lolol do finger pushups. The FK mouse has light switches, fact. Maybe it's stiffer than many mouses, but they are by no means hard to push. I can't see how they are too stiff, especially for FPS and especially for CS where you don't want to accidentally shoot.
But ye, if you know what you are doing you can switch the switches :) :)
possible, but risky without experience.
the safest way would be, to cut the huanos in pieces and then desolder only the remainings.
the traditional desolder method won't work, that's where the danger lies in, so don't even bother trying it that way.
take D2F-01F switches, as they fit better for huano replacements.