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Hi Jack,
You could try some basic red, green and blue photographic filters on the front filter thread of your various Sony E-mount lenses to get you some of way there. Not as good as the precise bandwidths of a matched astro filter set for sure, but can be had reasonably enough for a trial. Just try to standardise on one or two thread sizes if possible. You can also add a UV/IR if required.
Best
JA
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