I've been using
Retro Fighter's Wireless Brawler 64 Controller all this time. It's not a bad solution, but it just didn't 'feel' right.
With
8bitmod's Retrotime Receiver, you can use a wireless BT controller with your original N64. Pair that with the N64 Joycon Controller, what you get is a OEM wireless controller for N64.
The receiver also supports Rumble and Memory Pak, albeit 'virtual'. Meaning, you have to use their wonky web interface to do your optioning.
Still, probably the best solution for a while.
I also ordered
this, will report back results for those interested.
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