Alternative to a dakota bellhousing

Hi.
I am restoring a 70 Valiant 318 automatic.
I would like to do a manual 5 speed swap. Preferably a top loader one. My countrys (Switzerland) strict laws won't allow the extensive tunnel cutting required for a 4 speed swap.
I was thinking of swapping for a Supra Turbo transmission. I found a transmission for cheap.
But i cant find a Dakota bellhousing. Not in Europe, nor in th USA. Is there an alternative way to install a top loader 4 or 5 speed (preferably 5 speed) transmission? Or even better: does anyone know, where to get a Dakota bellhousing?
I also had a look at complete kits. But they are to expensive for my budget.

Have a great day!

Greetings: Noah