There's also several new 'silenced' switches[1][2] which have dampening built-in by moulding in a softer plastic into the switch stem. I can't stand the feel of o-rings; I use a Zilent switch keyboard for work and it's quieter than a lot of my coworker's non-mechanical/rubber dome boards.

1. https://zealpc.net/products/zilents

2. https://kbdfans.com/products/pre-orderaliaz-silent-switch-ta...

(unaffiliated with either of these stores)