Regarding Deskeys domes, they just debuted their T1 tactile domes, which I’ve found are rather satisfying for their tactility, compared their other options (and better than the KLC ones in every way because they come in 4’s).
Regarding dome gaskets, while deskeys’ site may talk about them, I didn’t really wind up needing them for just silencing rings (even 1mm ones). This might be the housing having a little extra room. The only time they became necessary was when I had both silencing rings and slider gaskets – silicone sticker bumpons that went on the bottom of the sliders. They wound up doing very little but make trouble in my build, causing there to be enough room for some silders to get stuck at the bottom. They might be more important if you were using open-top domes, maybe?
TLDR, you probably don’t need dome gaskets or anything for silencing rings, at least for the two types of aftermarket/non-OEM housings I tried (deskeys and KLC).
I actually had pretty good success using RO-59 dry film on the housings and silders. Completely unlubed, they would squeak and scratch sometimes. Nice thing about the dry film is that once it’s dry, you don’t have to worry much about it going places you don’t want it. Originally, I used 205g0 and I’m still cleaning the entirely too much I used off the first iteration of my build lol. Thinner lubricants should be better, at least for housings and slider lubrication. For stabs, you want thick grease. But avoid dielectric/silicone grease, as it can damage domes!
For the housing gaskets, they’re probably best for boards where the housings are a little loose with the plate. In my case, where the plate was exceptionally tightly cut, they actually caused seizing issues sometimes.
One thing not mentioned – landing pads for sliders. I’m still figuring these out, but they do seem to help soften some of the noise. They’re not as bad as typical MX sliders hitting plastic on FR4 as the dome’s in the way, but still could use some dampening.
I haven’t really noticed much of a difference between the sliders I’ve tried yet. Maybe I’m just a philistine with this Topre stuff. Definitely no purist here. 
Second all the recommendations. As a potential tip, I wound up using the top-mount for my keyboard as my jig – got some M2 stand-offs screwed into the top half of the case, and then mounted the plate to that.