In Gemini, FIL, ZEC, LTC, SOL incur lowest network fee. You can convert BAT to either, depending upon which one is supported in Coinbase, and then withdraw. Gemini will still charge ~0.35% conversion fee but for any amount less than 100 BAT, conversion works best for BAT.
Do note, there is still a minimum amount (~$11) for each crypto in Gemini for withdrawal. That’s also dynamic, I think.