It gets easier with time. The Heavy-6 must have been my 5th or 6th FC660C disassembly and I was done in an hour.
Mainly, I’d suggest
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Get rid of the screws super fast (a magnetic screwdriver helps here). Just go at it. Don’t think. See a screw? It’s going out
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When applying domes, you don’t need to get them perfect on first insertion. You can shave a good chunk of time if they are just kinda sorta aligned (and then you can push them in later)
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When applying springs, just drop them into the domes. A magnetic screwdriver helps quickly pick up the springs
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Finally, when all domes and springs are in, now you can spend time aligning them to perfection
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I’d suggest lubing the actual PCB as this implicitly lubes the springs, quietens the board, and keeps everything in place/from sliding around once everything is assembled
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A magnetic screwdriver really helps speed up the process of putting everything back together again