Indeed, there’s no technical reason why it shouldn’t be possible but I think many administrations require that amateur kit is hard-restricted to available bands. Still, the mod is simple and the hardest part of the process is getting the radio open!
If I remember correctly, the original FT817 could be "wide banded" in software without physical changes. I believe, based on postings in forums, that the American FCC frowned upon such features that could be implemented and removed on demand so the feature was removed in the ND and later versions
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