Creepy Christ, if you think these are too loud, I'd be straining to think of something that's quiet enough Oo . Linear switches or rubber domes maybe? Can't really think of what you could do to quieten Matias Quiets as they're already dampened two-way and non-clicky.
Or maybe this. Guaranteed very quiet! :p
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(http://www.dudeiwantthat.com/gear/phones/Cube-Laser-Virtual-Keyboard-1212.jpg)
Fair enough. I have a realforce at home and I thought that the matias quiet would be a similar volume. Thanks for the advice.