I don't love the layout of most Wormier keyboards, but if that doesn't bother you I'd definitely just get some new switches and stabilizers. That's the entire point of a hotswappable keyboard! As another commenter said, you may just be able to tighten and lube the existing stabs and see if that takes care of your rattling issue.
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I would tighten the stabilizers and lube them, chances are they are just dry and loose.
You can also try filling the space bar with silicone if you cant do new PBT caps.
How does one tighten stabilizers? Do you mean the screws for board mounted stabs? Also what kind of silicone are you using?
Replace the switches and/or lube them. Buy new Stabilizers - I like TX personally. Get some higher quality PBT keycaps.
Then buy another keyboard and mod that one too. Then a third and try different things.
Step 2: Bankruptcy.
Enjoy!
I wish I could but I'm kinda broke, just making sure I'm not missing out on anything since I've heard mixed reviews on my keyb, but stellar reviews on the bridge75