@mrm I don’t really need create TS or GPS coordinates from multiple sources to be shovel into one. I understand the limitations an if I am editing 2 weeks road trip (oh, those were some great times…), I understand this will not work. 
I will have to read through reddit forum before I post potentially duplicated question. Don’t want reddit police to ban me forever. 
@bdillahu True, pm4 and mkv can have multiple, but PS will “see” the date creation of that container and this will b wrong.
@awojtas Seems like you found your workflow. Great stuff. But I don’t use LR (I am trying to avoid having metadata in proprietary software). I have been burnt already by loosing few tools I used that got acquired or discontinued.
Thanks for suggestions! I’ll update this thread with my findings.
EDIT: Searched datacurator, but did not find any useful info. Here is reddit post: How to preserve metadata in video files after edits? Need advice. : datacurator