[quote]First off, I would never expect a merger of the two accounts
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So with all that said, my main question is would it be too terribly hard to add collections/triumphs/flair that was unlocked on PS4, to be updated on PC.[/quote]That would be merging two accounts, in part or in whole.
Unfortunately, no, you cannot get any data whatsoever shared between the two accounts that is platform account based.
If you want that type of content on your PC characters, you'll need to play through the missions and the like, the same as you did on your PS4 characters, and if you want the same Collection items, you'll have to pick them up the good old fashioned way on your PC characters. Your PS4 data will not be shared with your PC characters; it's not a service Bungie offers.
If you'd like to request such a feature, please head over to the Destiny 2 - Feedback forum and post your ideas on how to do so while combating the fraud that would come with it of people hijacking accounts and taking people's items and collections or of the ability to sell items to other people.
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I would gladly grind for them on PC, but these items are seasonal. Iron banner ornaments, emblems, faction armor(remember faction rallys?), dire promise.
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I understand there may be things you don't have access to because you didn't play those activities on that account. Unfortunately, as already stated, the save data is separate and will not be combined in any way. So you have to decide which one is more important to you.