Yes. See How to export rtk NMEA0183 from teensy to rs232
The only issue is you would have to make sure the baud rate off of uart2 on the f9p is set to whatever your 20/20 requires. And that it’s sending the messages required and at the right rate. If the 20/20 requires 5hz (and aog 10hz) the base rate can be 10 Hz and then on the messages going to uart2 can select a rate of “2” which would limit uart2 to 5hz (half the rate of the messages going to uart1). Hope that makes sense. This would be set in ucenter.