If you don't need it to be "piloted" and completely co-axial with the other side of the BB, why not order an m35x1 tap on Ebay from China? It will get here eventually, and I bet it would work just fine. Cheap enough to gamble on, too.
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Owner & co-founder, Cycles René Hubris. Unfortunately attaching questionable braze-ons to perfectly good frames since about 2015. With style.