By removing yourself from a course you basically took the spot of a recruit who could have gone on the course instead of you. This is one less member BMQ qualified.
It also shows a certain level of uncertainty which will impact your CoC's opinion of your dedication to the unit. They'll then have to question if you will do the same thing in the future. If the reason is medical or a personal family issue, they might understand. However, if it is because of preference, they will not be happy.
All members, NCM or Officers, have to do BMQ. BMQ for the reserves is the same for all members. So doing BMQ as an NCM will be the same as for an Officer. BMOQ is a different course done at a different time.
I'll give you the same advice that was given me; get your qualifications done as soon as you can. Also, weekend BMQ is hard than full-time summer BMQ for the simple reason that you have so much time between training weekends that you will have some knowledge loss from weekend to weekend.
Concentrate on the course, complete it, and don't worry about weekends off. If you get weekends off, great; just don't plan on it.
As for going Officer, that is totally up to your unit. Talk to your CoC and see what their process is.