Without a marriage planned, I'd expect the fiance vias to be refused anyway. NOT a good way to go as these are expensive and take ages.
3 options -
1 - get a fiancee visa and marry in the UK
2 - marry in Phils and get a marriage Visa
3 - get a visitor visa to visit the UK (likely to be refused but much cheaper to apply for)
if you get a fiancee visa and then return to Phils to marry there, technically you will have lied on the visa application as no marriage will take place in the UK.
Dishonesty on applications is a cardinal sin, and is very likely to cause problems with future applications of any sort.
