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I don't know of any software upgrade that will double the ISO rating for any Canon camera but I'd imagine the noise would increase quite a bit.
My 1200D goes to ISO6400 and I've used that with 30 sec exposures quite happily. The newer sensors seem to be far better than ones from a few years back.
I run the 450D at either 800 or 1600, it's top ISO and it seems quite good noise wise. A few darks sorts out any minor problems.
The 1200D only cost me $500 and seems to be one of the better DSLR Astro options.
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