ander when you get the keyboard can you report back here on how well that floss modding would work in an office setting?
I will, but don't get your hopes up on that... I've never used a board with it, but my understanding is that while it dampens the "springy" sound, it doesn't do much for the "clack" of keys bottoming out.
Are you familiar with the method people use to quieten keys on Cherry MX switches, where you roll a silicone o-ring down over the stem in each key cap? It's very effective, and
the rings themselves are quite cheap.
Back in 2009, someone
posted here on GH that they'd successfully used rubber washers to achieve a similar effect on a buckling-spring board (like the Model M). (You'd need to use something bigger, like a washer, since the key stems go
inside the spring barrels, and the barrels are wider than Cherry keycap stems.) Our user fohat.digs asked a few years ago about using such a method, but no one replied; I have a PM in to him asking if he ever learned more.