I would get your CFA designation first as it has the most value of the three qualifications you mentioned. Assuming you get your CFA charter, then getting a masters in finance is somewhat redundant. Not necessarily a waste of time but it doesn't really add much to your CV at the margin alongside a CFA charter. The only reason to get your CMA (I'm guessing you're in the UK or some other Commonwealth nation) is if you want to remain in an accounting-focused position. It's rare for folks to be both a CFA and CMA (or CPA in the US) because they lead down very different paths. I would start with the CFA and then re-evaluate - but the masters in finance seems the least valuable unless you're going to a a top program like Oxford, Cambridge, etc.
I'm not sure what your salary and trust fund distributions have to do with this decision. These seem like arbitrary (and somewhat odd) details to mention.
Just my two cents.