I am Malaysian (non EU countries definitely) and I applied my Bewilligung on June, got my B bewilligung two months later.

Its stated there 'Verleib beim Lebenspartner'. Neither mentioned whether seeking employment is forbidden nor allowed. (can somebody explain to me about this?)

The procedure is relatively easy. We went to Gemeinde Office and fill up some kind of forms. Together with it we also attached all the evidence of our 4 years relationships (copy of flight tickets, bills,credit card spending, photo albums etc). I also have to provide them my original Passports, photos and also my University Qualifications. And my partner had to agree to become my Guarantor.

The only problem was I didnt have any health insurance (Malaysian healthcare system is free). Once I applied my Healthcare Insurance, the Insurance company notified Gemeinde and they process my application accordingly.

The staffs there (Muri Gemeinde) were also very friendly and welcoming. They even suggested to us not to apply for Bewilligung and health insurance before our 2 months holiday back to Malaysia, (to save 2 months cost of unnecessary health insurance premiums) and apply the Bewilligung once we returned from holiday.
They also informed us after 4 weeks of application that the process might take longer than usual due to lack of workforce in Bern Migration office.

I heard from my Canadian friends who applied her Bewilligung on ground of having Swiss Partner, that the staff in Migration Office Bern were not friendly..but I guess that depends on who you were dealing with at the time.

So I guess it should be no major difficulties for you who got all the advantages..(compare to me in terms of country of origin,religion,and orientation).