I just bought the Mx milk switches you are speaking of the same board im sure kbt race 75%. They aren't bad at all. I thought they were actually gonna be louder judging from a youtube video. But getting mine today i really like it
You could swap out the switches but it would be easier with a pcb mounted board like kbt pure non led, i made an ergo clears that way in like less than 10 mins. With the cm you would have to desolder every individual switch. But if you got a cherry board with pcb mount for a good price you could make an affordable mx milk board or just go through the desolder work it isn't rough, just time consuming.
edit: the springs felt heavy at first, but after about an hour of gaming and just fiddling with them, I've become accustomed to their weight without straining my wrists. I really like the switch and will be keeping my board. As for topre you can't go wrong, but it may not be for everyone with that price tag.. My hhkb is coming in a couple of days and i was a previous owner of a couple topre boards, they are worth it IMO. Hope i helped sorry for the wall of text