Ok so kinda complicated but hoping I can find some help.
I recently discovered that D1 was backwards compatible on Xbox One, which gave me access to my vanilla D1 vet Guardian. This is the same character that I've had for the entirety Destiny's 7 years and I'd love to go back and mess around in that old sandbox
However, I'm concerned that some wires might cross and it could interfere with my D2 cross save account in some undesired ways. Specifically if I go back and finally beat the Rise of Iron campaign. Would new veteran dialogue and statuses just update for my D2 character? Or could something potentially go wrong?
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In addition to what ishikusui said, the veterancy import from D1 to D2 was a one-time thing way back in the day. As it was only one-time and has already occurred, any further changes to your D1 characters will have no impact whatsoever on your D2 characters. Playing on your D1 characters will not unlock the veterancy dialog in D2 at this point.