Is it OK to use 5w20 + Stop Leak instead of 5w30 oil in a H22A engine?

I've got a 1993 Honda Accord 2.2L L4 with 201k miles. Burns absolutely zero oil, perfect engine compression, silky smooth and quiet, but has some oil leakage. Instead of running recommended 5w30 oil, would it be acceptable to run 5w20 or 0w20 + Bar's Stop Leak (gasket seal) to prevent oil leakage? My car leaks a crap-ton of oil (up to a quart every 400 miles) - except with stop leak, in which case it leaks zero. I need the stop leak to prevent massive oil leakage, and cannot fix the gaskets themselves right now. Would 0w20 (plus additive) be better than 5w30 to prevent the oil weight from going too high?

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