2020 G90 V8 5.0L Tune options ! I already have the ECU Map/File ! Need support

[BeeDamn]

Hello everyone (I hope this is the correct forum path) I wanted to ask about the tune for the G90 5.0 ! And I read almost ALL the discussion about the 5.0 tuning !
it seems only option is GEP Tuning and they want the ECU/TCU To ship to them for tuning and I'm leaving far away overseas and can't bring the car there.
So I came up with a guy that he already pulled the ECU File and he can do a custom tune ! But he is not so familiar with our cars (Genesis/Hyundai)

So GEP Tuning wants 1650$ for a tune !!!! even if I sent the ECU file to them through Email and remap it then send it back !!!! and this is only tuning the ECU without the TCU & Fuel efficiency tune !

My question is, Do we have a different company/guy that can tune these cars ? The engine is promising but you can see the ECU Limitation in it !!
Or I may install an air/fuel ratio gauge and tune it with that local guy (Asking 300$) !!!!!! So I'm really confuse !!?

Lastly, Please excess my English and forgive me if I violated any rule in here as I'm new and I'm unintended to do it.