Enjoyed reading this thread. It's nice to read something positive with a lot of useful suggestions.
There are a couple of other things worth saying, but not that much.
regarding EQ. If you are going to continue using the turntable and are going to use EQ to improve speaker output, you'll need to do that in a way that can take analogue input from a turntable. Roon isn't that, as it's a file player. You'll need a device that can digitise and process the audio from the phono amp (or from the turntable and apply the RIAA processing to it). Of course, you can still play from the turntable without the EQ straight into a different amp input. Some people prefer to do that. You could digitise your records, or just ditch them for streaming, of course.
I would definitely investigate more modern speakers, but only when everything works with the ones you have already.