A few more titles that you will hate, but actually describe your role. You are in no sense just a senior developer.
You are an
- Architect
- Solution Architect
- Project Manager and Team Leader
- Service Manager
Which one fits best, you have to decide. But i would put this up on my resume if i had your responsibilities.
Nah you dont need a special image for the touchscreen and stuff. Check the advanced update settings for optional downloads and also give the surface app in the microsoft store a shot. It actually is not terrible for troubleshooting.
Other than that: Create your own custom image if you deeply wish to. Here is the help doc:
https://support.microsoft.com/en-gb/surface/download-drivers-and-firmware-for-surface-09bb2e09-2a4b-cb69-0951-078a7739e120