I did the first YB DCT in the world in 2020 and I took the risk on the fact that it was cheaper to test out than buying the Samsonas that would give me the sequential shift.
The reasons I chose the DCT: I had previous experience with full autos and it was never good. The DCT is a electro-mechanical and was proven in std form at over 1000nm.
I knew nothing about the ZF HP series at the time. Having driven the Getrag 7 speed DCT in the BMW I was convinced and bought one during covid for a very good price.
At the time, the method was to wire the external ecu to manage the gearbox solenoids, temp sensors and speed sensors directly.
I developed that adapter you have pictured, quite a funny story, I designed the product, did the CAD, proved it out before contracting Adamat to manufacture my prototype. On receiving it I knew I had to finish it (never send out a final product without an NDA in place), a few final operations but there is also an error I needed to correct in some dimensional issues.
A year or so later I am getting emails from people saying they have bought an adapter and it doesn't fit, Adam told me to contact you, F*cking cheek!!!
Guess what, tough sh*t, your problem. I would not sell them despite being asked until I have made a few to prove them out, but no, people though they could do better lol.

So fast forward, I knew I was fully in development both with the ECU and the product, various growth in the SW development from the company I chose, plus others now sees some options for using factory TCU and no wiring changes to the box and closed loop learning strategies.

Now, 2023, I know loads about the ZF HP series (I do a lot of work with ZF) and the 8HP units are used a lot more widely than the Getrag thus more units/variants and cheaper options are around.

Typically Getrags are now upwards of £1500 but will do over 1000Nm in std form, ZF8HP comes in 450nm, 500nm, 550nm, 750nm, 950nm depends where you are in the world with lots of bellhousing configurations.

If I was to do another of these it would 100% be an 8hp series, the cases are smaller, a little bit lighter and cheaper.

Many ECU options around now, I am more than happy with my choice and have zero issues with it. What I would say is the conversion is not for the hobbyist, you need some skills and knowledge way wider than a Cosworth YB engine.
If you get the engine ecu wrong you melt pistons, if you get the driveline ecu wrong you go through the nearest wall (substitute as you feel).