[HoMM V]9 Race - Swamp! Is it needed?

Has anyone tried to delve into the code at a low level, like mod developers did in Heroes III? The lack of IDs in the range doesn't seem like an insurmountable problem...

I would really like to, but the code isn't available; it's closed. Compiling assembly is not an easy task. And it's practically impossible to figure out the hexadecimal code... No, there are ways, but again, it would take a long time; you need to sit down and patiently study it. If they gave us the source code, it would be fine...
There's another theoretical option: write a replacement for the original code. Something like that was done for Heroes III at one point. The idea is that all the resources are available, and theoretically, you could link them together into an executable. But at a minimum, you need an AI specialist; it's not a simple task. And it's unclear what to do with the multiplayer aspect in that case, how to implement it, because without multiplayer, the competitiveness is zero...

I've seen some mention of something called Heroes V Revival of the Far East. Interestingly, this query is well-known to Google. However, nothing can be found in Russian or English about it. How active is this development?

I don't know, but thanks for the tip; I'll take a look.
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No, I don't see any reliable information...