Thank you for your replies, Andy and Harry.
Ok so I will be using silicone (the one used for sealing kitchen counter tops) to "glue" the pitot tube to the wing (after drilling a hole, of course). I'll try to stick it out as much as possible.
I am gonna give up on my idea of using electric cable extension +connector and I will go with Harry's suggestion of using quick connects. But all that I could find was "Robart Quick Disconnect" - see photo. I assume there are the same thing. Also Robart 169B air line (photo also attached).
Just trying to get everything right without breaking anything
One more question, please, Andy: what is the latest software revision (firmware) for DX7s? Mine seems to be at v 1.00.
Thank you again and happy flying!