I am doing almost exactly the scenario you described with the TX 500. Except the beach part. Works very well. I've done FT8 in particular but other digital modes as well for hours, and as another poster indicated, sometimes the radio gets a little warm. That's about the extent of it.
I've also found in that mode, that I use a little external speaker, that someone else in this group put me on to. The microphone is just clutter if you're doing digital modes. Arguably, you don't need a speaker at all I guess. I however really like to listen to what's going on even if it's digital.
Best of luck, Jim