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After ~15 years of PC gaming from my couch and it being an admittedly awful experience, I finally figured something out that I feel basically as comfortable with as sitting at a desk.
Cheap laptop "lap desk". ie:
60% mechanical keyboard (although ordered a compact 85% one for the F1-F12 row which I realized I was missing). Regular gaming mouse. Peripherals plugged into a mini USB hub hidden underneath the lapdesk, long USB extension cable to plug it into PC.
Got the idea from those expensive gaming lapdesk products, just did it much cheaper.
Lets me play MMO's / FPS on my couch in front of my 106" projector screen. :)