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For the versatility/portability I would stick with the 80D (I've used an unmodified 70D for ages) or maybe a second hand modded DSLR. Going to a dedicated astrocam requires additional gear to get the most out of them - external power, a laptop/pc, filters, etc. And a good astrocam matched to the Redcat, something like the ASI183MC Pro, isn't a budget option at ~$1300.
So for now, stick with the 80D. Test it out, see how it suits what you want to achieve. It has both the portability & versatility you require & can be used both for astro & wildlife as is. Then if you want more for your astro consider a modified DSLR.
Cheers
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