Concrete wall basement retrofit UP switch?

Hello everyone,
We are currently having a semi-detached house built by a developer, and the contract includes the electrician.
After an appointment during the shell construction with the electrician, we were told that he no longer installs flush-mounted switch boxes in the concrete walls of the basement hallway because he had problems with the developer in the past. He completely refuses.
However, we would really like to have one flush-mounted light switch in the basement hallway.

Would it be possible, after the electrician has finished and installed the switch access point, to install the flush-mounted switch?

PS: Our neighbor is doing the electrical work himself and has installed the switch directly flush-mounted as well as all the boxes in the basement (looks chiseled).

Thank you very much

Best regards, Rene

He completely refuses.
Now we would really like to have the one UP light switch in the basement hallway.

Would it be possible to install the UP switch after the electrician has finished and installed the Accesspoint switch?

The switch also includes the wiring that would run UP in the groove / empty conduit. Simply "lowering" the box is not enough. But: could he have reasonable grounds for his refusal? - check here:

of course depends on whether it is about interior walls or exterior walls. Not every WU basement is completely constructed with concrete interior walls; you can also build with masonry inside.

Not every WU basement is completely constructed with interior concrete walls; you can also build with masonry inside.

I know. But this is about a concrete wall - whether an exterior wall, we don't know. Maybe the electrician was folded together so thoroughly that it doesn't make any difference to him now.

This is an interior concrete wall. (Load-bearing wall). According to the developer, however, a single flush-mounted switch should not be a problem. As mentioned, the contractor installed it flush-mounted with the approval of the construction manager... I forgot to mention that the electrical cable will run on the back wall in the basement room and then be drilled through the concrete wall to the SO switch...

PS: THE electrician would have to pay a lot of money because he installed several flush-mounted boxes in a load-bearing concrete wall, thus compromising the load-bearing capacity...