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hi Jimmy,
I did a similar thing to what you are planning. I had a dslr (although it was spectrum modded). I ended up purchasing the following:
CCD CLS (light pollution)
Ha
Oiii
S2
and then RGB after I got my mono camera. the process was staggered, I didn't want to end up with a mono camera and not have any filters.
I would recommend the same order. light pollution filter made a huge difference for my images it is nearly like a nb filter for broadband.
A debayered Ha image will be ~ 1/4 the size of the regular image and while it will give a bit of a boost I'm not sure it will benefit a substantial amount with your current camera unmodified.
Also consider that your sub exposure time will go up dramatically for narrowband even more so for an unmodified camera. perhaps keep an eye out for second hand filters as well in the classifieds.
good luck
cheers
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