Well, why would Poland be partitioned in an alt-Congress of Vienna? It may instead end up being pushed into a personal union with Russia (that was the terms Russia gained Congress Poland under).
fasquardon
If PLC switch sides and reforms during Napoleon reign (I assume that it'll do so earlier- Russia will need troops when coalition wars kick in. And because at this point PLC will be just slightly less populous than Russia and on similar level to Austria- it's perfect source of troops), it may end up like Bavaria otl. Or PLC might not switch sides and end like Prussia- divided and reformed after war as a winner.
Anyway- PLC with pre- 2nd partition border in 1815 won't end up as Russia's vassal. It'd make Russia too strong too fast. And Napoleonic wars can go either way too. Otl Napoleon lost 10000 horses just by getting to Vilnus (!) during war with Russia. If Poland switch sides, then he only has to reach Moscow from Dzwina river. It cuts distance (and supply lines!) at half, gives Napoleon (potentially) about 200-300k troops (up to 400k basing on population base- and because Russia is significantly less populous- it won't have otl 500k too!). So Poland might very well end Napoleonic wars with pre-partition border... Or more if Russia really screws up.
EDIT: Most importantly- don't look at Poland after Napoleonic Wars (even if PLC joins and lose!) as a potential target for partitions. ITTL PLC never was partitioned and it'd be precedence to do so! What's more- at this point, PLC most likely exists, and Prussia doesn't. Existing PLC changes world (or at the very least Europe and world indirectly), completely. Napoleon can decide to marry into PLC rather than Habsburgs (who were quite unreliable), and he won't have much trouble in turning Poland into real ally, rather than forced one. He can give PLC plenty of things (like independence, reforms, pre-partition borders) at the same time fulfilling his own goals (dismantling Prussia, keeping Russia in check).
I can't even stress how big impact PLC would have on any coalition war (and coalition members would want PLC to reform- they will need troops desperately as they did otl!). Pre 2nd partition Poland still has about 500k square km, about 20-25 millions of people (approximately in 1810. Otl PLC had 14 millions before 2nd partition, so I think we can safely assume 20 millions by 1810) and lies in perfect (and only) spot for invasion on Russia. With such size, if PLC switch sides in good moment, it can easily regain Prussian and Austrian parts of former territory, at the same time signing Prussia's death warrant. Because Napoleon doesn't need potential stab in the back which Prussia can provide (well- Poland too, of course...) and he did planned to dismantle them otl already (although Prussia might be less cocky without half of its territory and population...).
Anyway- if King and Czartoryski Family decide to cooperate closely and crush insurgents early, then we've Poland with 30k standing army by 1769, reformed judical system (very important thing. Otl person responsible for executing court order was... plaintiff. That's why anarchy grew to monstrous levels- every day noble fought noble over small things) and PLC having 10 millions inhabitants and covering 700k sq km.
If we stick to "no 2nd and 3rd partition". it's likely that- in cooperation with Russia (I might be wrong about it, but as far as I remember* , Great Sejm was called with Catherina's the Great consent!)- same reforms (and more- Great Sejm was supposed to clear ground for army reforms needed in case war with Turkey goes wrong) pass at this point. I don't think anything interesting will happen before Ist Coalition war and Campio Forno (Russia might give PLC green light to reform until then), but then we've 2nd coalition and things get spicy...
*Yup, I was right:
http://en.wikipedia.org/wiki/Great_Sejm
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