I may have missed something but if the old 9300T still provides a serviceable solution to watching and recording Freeview programmes on the DTT broadcast platform then you could augment it with a modern, comparatively inexpensive Chromecast or Firestick dongle plugged into a different HDMI socket on the TV to gain access to all the usual (and not so usual) online services like iPlayer, Youtube, Netflix etc that are out there.
Actually have you check if your new B&O TV supports casting itself? If so then not even any need for a plug in dongle.
‘New’ means ‘new to him’ 😛
https://beocentral.com/beocenter6-26
I wonder what it’s been doing for the last 17 years?