Convert '65 273 from A904 to manual column tranny?

Hello. Greets from Switzerland.
I have a '65 Valiant Wagon with a 273 engine. From the factory an A904 automatic transmission is installed (column shift). But since I don't like automatic transmissions at all, but I love column gearshifting, I'm thinking about converting the car to 3 gear column gearshifting. The A230 is a fully synchronized gearbox. Does it exist as column version?Or what do you recommend if you want a manual gearbox with scolumn gearshift.
The a745 is not all synchro, as I know.