I mused in the past that scripts like Power Delete Suite might work as they simulate clicking a button and such on old dot reddit dot com instead of directly calling the API. (Technically they are indirectly using I guess as old reddit uses the API internally but so what - is reddit going to suspend their own API key for going over the limit?) Someone just needs to figure out how to a) modify PDS to be able to accept the archive data and b) longer-term work with the new reddit desktop website instead of relying on old reddit, which a lot of us don't trust to stay around forever.