Just because i was interested if there is a custom board with RFM69 also, i asked a seller on ali - he sent me this link:

https://de.aliexpress.com/item/Suitable-for-Arduino-rfm69CW-wireless-sensor-wireness-node/33006101437.html

not a nano (but a 328p), not as cheap as the RF Nano (but cheaper as feather / moteino..), perhaps useful for the ones using rfm69 already..