What you are essentially suggesting [i]is[/i] account merging, which is not a service Bungie provides. This would be an enormous undertaking as each account would need to be manually merged (not everyone wants their accounts merged).
I was in the same situation not so long ago. I played primarily on PS4 up until end of Season of the Drifter while occasionally keeping PC account up to date. Then switched to main PC account and keeping up PS4 every now and then.
Once I learned of the cross-save, I decided to use my PS4 account as the main. The problem was that I had more seals, pinnacle weapons and triumphs on PC. It took me couple of months, but I did it. Last item was Redrix and I got it few days before Shadowkeep released. So, it's not going to be easy, but it can be done and that is the only way to keep such things as veteran status.
Don't get me wrong, I left behind so many god rolls and emblems with high scores on my PC account that it'd be nice to have those back, but...
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Maybe someday, but not anytime soon. I don't have anywhere near enough time in a day to grind all that. I just recently got revoker, recluse, mountaintop, randy's, edgewise. Plus everything else since Cayde died.