I'm not sure if it is too late to start with a CIMA. I was originally toying with the idea of completing an MBA. But a lot could happen in 6/7 years to warrant such a huge investment - personally and financially.
How old are you?
I'm 40 and I've thought of doing a CIMA (basically because I qualified abroad and here in england most companies require what they call 'proper' qualifications
), but I just feel that I can't concentrate as well anymore, and it'd require a load of work.
Also because I can't help but think that I'd just be learning about stuff that I've learnt already, and most of the things I use at my work anyway.
Would like to do some sort of a part-time course in an unrelated subject though... just to keep my mind expanding, hehe
Some companies pay for a MBA, you could try to check with your HR, if it'd help you grow within the company.