Depending on its stylus type, that old disco / radio station workhorse of a cartridge wasn't bad - but, presuming you no longer need its back-cueing robustness, it may be worth experimenting with something from, say, the latest Audio Technica VM range of cartridges. There's this:
Free delivery and returns on eligible orders of £20 or more. Buy Audio-Technica AT-VM95ML Dual Moving Magnet Cartridge with Microlinear Nude Stylus at Amazon UK.
www.amazon.co.uk
Or with a lesser stylus, one for around £40.
(The detachable headshell makes cartridge experimentation easy).
Likewise, that Technics deck of yours was, as you know, often regarded as more disco than h-fi. Now though, more people are coming round to the benefits of the high-torque direct drives. You may have seen favourable reviews for their new 1500C model - It's £900 (although that includes a £90 cartridge), many would say your 1210 is better - not least for being Jap. made as opposed to Chinese.
I certainly wouldn't be looking to buy another TT if I were you.
As for archiving vinyl. Nice idea. There's a couple of us here that have done a bit..... We thought ripping CDs was time consuming!
If you're gonna do it properly - divide album tracks, remove all pops and clicks, find best quality album art, add metadata etc......no joke Jon, you need to take your age / life expectancy into consideration.
Those into streaming would ask why anyone would bother - but no doubt you've got vinyl that's not available to stream (not to mention mixes / recordings that just sound better) - maybe just do those.
So keep the TT, try a new cartridge, then decide whether or not you need the USB output on any Phono preamp - then you'll get some suggestions.
As for streaming / bluetooth, I use separate, cheapy items, so don't know enough about all-in-one solutions, but others will have plenty of suggestions for you.