Convert FLR (FP) to FLR (M)

[Tier 4]

I have applied ILR on Set (LR) and for my Mrs FLR (FP) because at the time of her application I wasn't able to meet the financial requirement of £ 18600. However I will be able to meet this requirement till April next year. My questions are:

1- What are her chances gaining visa on FLR (FP) after my ILR?

2- Is it possible to get spouse visa on FLR (M) after successfully obtaining FLR (FP) visa. Or in other words can FLR (FP) visa convert into FLR (M) spouse visa later on (consider meeting all the requirements of FLR (M))?

3- In case they refuse her FLR (FP) application and we launch an appeal; what are the chances to vary FLR (FP) application into spouse visa on FLR (M) application during appeal process on 3D leave.