Thanks Doc, that P1 looked like just the ticket until I realised they don't ship to Aus.

I've found this but don't know if it would be appropriate:
https://www.ebay.com/itm/KLD-vintage...0AAOSwON5bmPzD

For a bit less than the price of the Lamington Jr you get a 15w kit with a 3 band EQ and reverb, all on a PCB.

Looks like its BYO cake tin, cab and speaker, but other wise thumbs up?