Skandix seem to have a generic "classic" starter (perhaps dash mount), as well as a listing for the starter switch.
I've butchered my entire assembly. Not happy with myself but I was (still am) broken down in a doctor's emergency parking whilst loading some items for what was an urgent turn around. I needed to get to work and worked out how to start the motor but removing the assembly to bypass the steering lock required drilling and when that only worked on one side.... Well the rest is history. They are not intended to be easily removed.
This is what I need. Because they're a PIA to remove I didn't think it'd be easy to find one but still hoping I can. Otherwise entirely bypass and place a push button under dash.