Not sure what your asthetic standards are (mine are low;) but I would have thought a few components attached to a (smaller form) esp32 all thrown in a simple 3d printed enclosure would do the job?
I’ve never done PCB design so can’t speak to that.
I decided to leave my diy RF blaster “naked”
I do like the rttl buzzer on mine so I can hear a signal has been sent/recieved.
