O-ring mod for the Two HE

[sudden tapir]

Dear forum, I consider reducing the klick noise of my brand new Wooting Two HE keyboard’s key cap click sound.
First, I changed the Lecker 60 switches to Lecker 45 V2 (for Gamer keys like WASD…) and Gateron Jade Pro switches for the rest, which improved the sound a bit.
Next step would be O-ring mod for the key caps. I wondered as modders recommend a max. thickness of either 0,2-0,4 mm (which are nowhere available) or 1,5-2 mm on the other hand (easily available)). Which ones would you recommend?
How about adding some extra foam inside in the keyboard case unter the PCB ? Question: Will I loose my warranty by that?
Does Wooting offer metal cases for it? Can you maybe recommend any?

[compact yoke]

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[sudden tapir]

PS: Can I add a sandwich plate like the 60 HE has it? If yes, can you recommend one?