If you are a resident exam fees are sponsored for first try.

As a resident you can apply conjoint mmed(internal med) with mrcp.
Essentially the exam is the same mrcp in singapore. But they give you a free mmed.

Alternatively you can go uk to do mrcp. Then it is just an mrcp (uk) no free mmed
As for whether is uk mrcp easier or singapore mrcp easier, really depends. Some say local profs more anal. But in uk, you need to be familar with their local diseases like porphyrias, cystic fibrosis which is unheard of in singapore.