You know you can get quiter mech keyboards? Also sometimes people put O rings on the stem of the key to dampen the sound. I don’t think there are any slim mech keyboards- though there are nice small 50%, 60%, 65% and 70% keyboards
Edit: here’s what a 50% keyboard looks like, pretty cute right?
There’s one of the Cherry DW 9500 i have now, with their new slim switches and for two times the price. But i was satisfied with this one and it’s not worth the effort for me with dampening.