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You don't need to spend anywhere near that. You can get one or two narrowband filters for a few $100 and combine the data with your RGB captures. You only need a filter wheel if you need to rapidly change between filters; like when you're doing planetary imaging, and then RGB is all you need (narrowband won't do anything for planets).
Unlike planets, DSOs don't change their "face" so there is no rush to change filters. You could even do RGB one night, H-alpha the next. A mono or at least IR-filter modded camera for narrowband stuff would be helpful but not essential.
Also, instead of a specialised filter like e.g. H-alpha or O-III, you might start out with a general purpose nebula filter, something like the DGM NPB, which will increase detail and contrast on most nebulae. You can use filter captures as e.g. luminance data (or whatever your preference).
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