Successfully sold my first chunk of bitcoin-jr (BJR AKA BTCB2).
First split it from BTC using hampus (npub1v4v…xwu8)’ splitting tool: https://github.com/hsjoberg/bcashjr-wallet/releases/tag/v0.0.1
Then sold for BTC on NeoxEX: https://neoxa.exchange/trade/BTCB2_BTC
Use both the wallet and exchange at your own risk (I only did fairly small amounts), but it does work.