To be honest, that would be second TL period that has Russian Tsar marry a Stroganova and the first one with this particular girl (speakin' of both Russian forum (fai.org.ru) and this one).
I saw Godunovs survival TL which used Elisabeth Stroganova (a cousin of Pelagia from junior branch) as a placeholder Tsarina in 1670ies-1680ies in a timeskip genealogy (author timeskipped to the end of 18th century from 1620ies and used fill-in genealogues of European houses to cover the time in between.
But Pelagia seems better. Her branch was richer (and would be even richer TTL).
In addition the problem with Elisabeth was with to whom her sister married (one of best friends of Tsarevich Feodor); if we presume Feodor & Alexei Jr. were roughly part of the same crowd of young men, it would be just boring "a friend recommends his in-law to the Tsarevich", without exploit of novelty WI of a Tsar married to merchant princess.
I saw Godunovs survival TL which used Elisabeth Stroganova (a cousin of Pelagia from junior branch) as a placeholder Tsarina in 1670ies-1680ies in a timeskip genealogy (author timeskipped to the end of 18th century from 1620ies and used fill-in genealogues of European houses to cover the time in between.
But Pelagia seems better. Her branch was richer (and would be even richer TTL).
In addition the problem with Elisabeth was with to whom her sister married (one of best friends of Tsarevich Feodor); if we presume Feodor & Alexei Jr. were roughly part of the same crowd of young men, it would be just boring "a friend recommends his in-law to the Tsarevich", without exploit of novelty WI of a Tsar married to merchant princess.
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