Tips for historical-ish Austria/Ottomans mp campaign

Hey guys, just wanted to hear any suggestions on how we can ensure a smooth, semi-realistic ottomans-austria campaign.
My buddy and I want to try these nations, as ottomans i would focus on conquering anatolia and the balkans while he would focus on building tall and trying to snipe the perfect royal marriages with bohemia and hungary to get them into a personal union.

So as the ottomans I am mostly all set, expansion through conquest is easy enough, especially as the ottomans with the rise of the turks situation. but austria isnt as clear cut.

my main questions are regarding the hussite wars. wht is the most reliable way, as austrian hre emperor, to achieve a quick victory here and flip bohemia back to catholicism? is it possible to diplomatically win the situation and avoid a full on war altogether?

and finally, i know of some austrian-specific events like when tirol has no heir by 1355, an event fires that can give austria tirol as a vassal/fiefdom. are there any that give a personal union with bohemia or hungary? or at least a casus beli? if no, how can my friend mist reliably get a personal union with bihemia and hungary?

if i recall correctly, it is possible to force a royal marriage through war, and i would be willing to work together with him for this (as ottomans i would attack hungary, kill their armies and then my buddy could simply walk in, siege the capital and get the royal marriage without much hassle, if he even needs the help that is)

finally, some games i had ai hungary ended up in a pu with poland, naples and croatia. how can we dissolve pu‘s like this?