during Napoleonic era
Napoleonic era was a time of confusion and there was no independent Poland back then. Good old Polish tradition, dating way before 19th century, prohibited Polish noblemen from accepting foreign orders, decorations and honours (not to mention high offices!). Sure, some of them accepted anyway - especially during partitions - but it was morally doubtful and more often than not frowned upon.
We have a distant trace of this even in today's Polish Law of Orders and Decorations which, in the article 5, states that...
"obywatel polski może przyjąć order, odznaczenie lub inne zaszczytne wyróżnienie nadane przez najwyższe władze obcego państwa, po uzyskaniu na to zgody prezydenta"
... so it takes an official permission of the President of the Republic of Poland to accept even a foreign state decoration, not to mention a high honour/office.
Besides, in a situation where we have an independent Polish state, it would be a rather dreadful act to accept a foreign high office
especially of a hostile country where the question of divided loyalties would inevitably appear.
such a sacrefice on your part (...) would give much needed calm regarding Russia for Poland and Russia
Look, I can become a member of Polish-Russian Friendship Association or even accept the position of the President of Slavic Unity Movement (because that would be an international position - just like a position in the UN or the EU - and not a foreign honour/high office). Sorry to disappoint you, Gruni, but it's a "no", even if only online and virtual. :)