Community cart for Bluetooth controllers with 3DS?

[retrospect]

Is there a community-designed cart that has a modern Bluetooth chip to let players use accessories like controllers or keyboards with 3DS?

Or a commercial cart?

Or, Pokemon Typing Adventure had Bluetooth on-cart, so is there a firmware that can use that for Bluetooth? iirc it was Bluetooth 2.1 so not good for controllers. Fine for keyboards though.

I'm thinking this would be neat with the telescopic mobile controllers that are available now.