As an experienced user of a mono CCD with filter wheel, I recently spent an evening with my Canon 6D taking some comet photos through a 130mm refractor and was blown away by the ease of getting very good results so easily. I tried a few deep sky objects with it just for fun. Very respectable images of M42 and M45 in single 60 sec frames without even trying.It's certainly a lot easier than CCD fiddling and instantly gratifying results in full colour. So I'd say your original idea was a good one. it's also great for general photography (the full-frame sensor is such a step up) will also give you opportunities to take wider fields and great starscapes like Jason's here
https://www.flickr.com/photos/jasonw...7647002665793/