Has anyone used an aftermarket coil like MSD blaster?

[Red]

"but with platinum spark plugs w/ larger gap"
FWIW, in the US the platinum tipped plugs were STOCK and there was nothing different about the gap spec for them. Except, Toyota apparently had multiple gap specs depending on the country the cars were being shipped into and probably emissions targets. They kept shipping new pre-gapped plugs set to the wrong gap, according to the US specs. No one seems to know why.

Platinum tipped plugs (we couldn't afford full platinum plugs) withstand heat and wear better, but otherwise they work exactly like copper plugs. And despite the factory instructions "do not adjust gap" you CAN adjust the gap without any bother. Same as copper.