Hi!
Thanks for reaching out. In general, it is possible.
However, you would need to edit the sketch for REXduino in order to read out the touch position and communicate it to REXYGEN which could be pretty challenging (depending on your programming skills). It would require knowledge of the REXduino communication mechanism which is not documented (except the code).
What about posting the touch position information via REST API to REXYGEN? Example "0302-11 ESP8266 REST API" might be used as a hint.
Kind Regards,
Tomas