The recently released ZX Spectrum NEXT, an upgrade to the veritable ZX Spectrum platform of the 80's, has contemporary new-school Teletext capabilities:

https://dashboard.nxtel.org/Help/Topic/FAQ

I'm yet to enable it on my ZXSpectrumNext yet (too much fun playing old - and NEW! - games) but its on my list for the next few weeks.

There is also a thriving BBS community based around the ZXSpectrumNext .. everything old is new again, and we seem to be at a point in the road where anachronistic computing may soon give rise to an entirely new user platform ..