Well technically I currently only have blacks and would require the purchase of a blues board to do that. But I'm going to buy blues anyway at some point.
How much effort would it take to individually replace each string of each key of my keyboard? And where would I find springs that are stiffer than blacks springs, yet compatible with the cherry switch?
I think you have to take the switches out to get to the spring, so it will be a fairly labor intensive process. You'd have to really want to do it.