I believe I heard someone once say the new Rich Text Control in PowerBuilder is really the TX Text Control and it has all / most of the features of the Enterprise version. So looking here it looks like it does support Excel too
https://www.textcontrol.com/products/activex/tx-text-control-activex/features/
Definitely worth giving it a try. Note there are multiple version of Rich Text Control in PowerBuiulder so you'll want to read the help to make sure you are using the latest one, as you have to select it somewhere in the IDE as your default Rich Text Control, and you'll need to using a realtively new version of PowerBuilder to get all these features (2017? 2019?)
It's fairly easy to use once you are using the right one, so you should be able to test it pretty quickly.