Update!
So I've found something that I was not expecting would tick the box for me, but it may be a great outcome - a Supro Supreme!
Its a 1x10 combo, 25w, 6v6 based with really basic controls.
I tried it at rehearsal last night and it just killed! They sound a bit 'normal' at low volume, but I had the volumes (plural - it has 2 channels that cascade or something like that) running at about 7 and it just came to life and sounded amazing. Very clear and articulate, but with just enough crunchy breakup.
The real interesting thing is how well it handled low end. I was expecting a weaker bass response due to the 10" speaker and smaller cabinet size but it sounded fatter than other 2x12's I've played, and much fatter than my Blues Jr. Thick and articulate with super sweet fender-esque mids and highs. No reverb though, but I rarely use that in a live setting, most venues add enough naturally.
I'll try it again at next rehearsal and see how she fares for round 2.