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Duplicate Tropes discussion thread
would be a good place to get some basic feedback from others on whether the tropes you're looking at are really duplicates, or if you're missing something. Tropers there can help you figure out how to prove or disprove your case. If it seems solid, you'd eventually need to take the proposal to Trope Repair Shop.
I really recommend reading that page, and spending some time watching and participating in existing TRS threads before you attempt to bring a proposal there.

There are two closely related tropes I'm thinking of merging into a new one that essentially will cover both should my proposal pass. Where should such a discussion take place?