I can answer this question already.
Checked it and tested and it works fine.
The units above 256 can be used as the dismounted option of the 'real' ones and when dismounted will appear with its own name, animations, icons, stats and everything else just like in custom mode.
This clears even more space for the original units - another 10+ units per campaign in PMTW 2.0.
I also tried if the new units case CTDs if used by added factions and except the usual limits (certain animation folders) there is no further danger.
Completelly safe and damn useful.

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