Hate to burst your bubble friend but the Sole Survivor wakes up on October 23, 2287, that's 5 or 6 years after the second battle for the Dam (give or take depending on whether or not the player clears the main quest before new years) the start for FO4 is simply too incompatible with FO3 and FNV, so much so that you'd be better off either overriding FO4 entirely to reimplement TTW in the newer engine or do what other projects did and add a "tales from liberty city" button to the main menu for TTW stuff.
This is all without saying how impossible this would be to begin with without Bethesda themselves making hd remakes/getting someone like obsidian to do so for them (which is effectively what the previously stated would have accomplished)
:edit:
this was a reply off of the second to last post on the first page, for some reason I was oblivious to the fact there was a second page in this topic and confused myself for a bit when I saw Rise's post thinking I somehow posted in some new or wrong thread XD
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