Well, since your wife will be entitled to WORK in the UK, should you decide to marry and bring her in on a spouse visa, I'd have thought the 'likelihoods' would balance each other out.
What is their problem ?
eta: Ah, you were originally asking about fiancee visa.
The answer is to marry her in the Phils, as you've mentioned.
You'll have a better chance then IMO.
