Oman/UAE
Ex-pats from the Gulf tend to drive/return to europe via Oman/UAE/KSA (Saudi)/Jordan/Syria
I live in Oman, and there should be no problems in the lower half of the gulf, getting through Saudi will be your only challenge.
You can probably get your bike put on a boat in the UAE, and off-load in Pakistan; But I have never done this.
There are BMW bike dealerships in Dubai-UAE, and Muscat-Oman - should you need parts/specalist help. Tyres are however are very difficult to find....
PM me if you need more gulf specific info
Good luck
tim