The main thing I'd say is you won't save much as you would have to invest in a filter wheel and filters which gets pricey.
You could get the ED80 triplet in the classifieds here on IIS for under $600 and use your DSLRs to capture full colour images.
It will be way easier to learn by not starting out with mono, and way less frustrating, and uses the gear you already have.
Then if the astrophotography bug really bites you, you will still have a high grade scope, and can add filters, wheels, mono CCDs etc. at that point without having to upgrade the scope.
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