Can I use rimless tape with an inner tube on a regular (tube style) rim?
The short answer is yes. Tubeless tape will support using a tube just fine. Tubeless tape does not stretch (much) so the indentation at the spoke holes is very minor.  Remember it is holding back the same force per square inch as regular rim tape, if it gave way the edge of the spoke holes would cut the tape and the tubeless tape wouldn’t be doing its primary job of retaining air. Finally, while the adhesive does a great job of keeping tubeless tape in place, it can still shift  if extreme lateral force is put on the tape (e.g., a very tight tire + tube+ rim combo)