My Wife entered on a spouse Visa which was multi entry.
I have no idea on fiance visa, some of the ladies on this site entered on a Fiance Visa may know better.
One thing you need to consider is if you wish to gain ilr and maybe citzenship in the UK or even just renew your visa you need to spend a particular amount of time in the UK (at least for the spouse visa).
So Poping in to the UK and then spending most of the six months outside of the UK in either europe or the phillpines may affect your application for FLR/ILR.
I would if i was you email the embassy explaiing your situation and asking for their answer.
The visas regulations and laws in the UK are changing dramtically at the moment and i would make sure you have the latest information.
Your situation is pretty unique so not many people on here would be able to tell you what can/would happen.
Also beware when reading up on the situation as British embassies all it seems have differnt procedures and sucess rates for applicants.
