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That's not possible either.
In X Day protocol, Suzuha didn't mention Kagari to the lab members until much later. The reason is that she wasn't sure what to do considering Okarin still refuse to help her, leading to her questioning the reason of erasing the future due to Kagari's outburst. That and Okarin couldn't interact with her for a while because of what happens in Pandora's box.
Yet, the anime clearly have Suzuha telling that to Daru in the lab still decorated with Christmas stuff (which never happened in Stray Sheep route because everyone were busy).
Also, remember that Okarin never could see the end of the christmas party because of the USSR world line change.
Because of this, it cannot be both word lines shown seperately at the same time: a segment of episode 4 is basically both routes and some anime original stuff used to combine X day protocol and stray sheep.
Regarding the route system in 0, you absolutely don't need TA, MG or GS. Those are basically possible world line, similar to the delta, gamme, omega etc sidestories which are never seen in the original sg, yet are possible for the sake of "possibilities".
As for the inconsistency for having PR and V&A necessary to reach MWC, you are missing something: the DRINE is basically the trigger of the change.
Suppose PR is similar to the beta wordline in the original SG, and VA is the alpha wordline, there is no issue there: Okarin basically went through PR route, then changed the past by sending the DRINE. This triggers a world line change, but instead of seeing what happens with the reading steiner at the present, the game basically shows you what happens with the DRINE.
It is worth noting that Stray Sheep starts with a world line change, reflecting the fact Okarin isn't in the same world line as X day protocol, because he doesn't have everything for operation Arc Light and operation Skuld.
Of course, it is also due to the game format following a more classic route structure in a normal VN, instead of being linear with merely branching ends. This also explains why you can go to V&A without the DRINE, but considering how the game was written, VA (and optionally GS) don't make sense without reading PR route first.
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