Essentially you seem to agree with my suggestion, am I wrong? Austria can claim lands or lapsed fiefs only because they are emperor, the same as it happened with Spain for Milan.
As for Jacqueline of Bavaria, are you talking about Jacoba, no? She lost her claims in favor of the duke of Burgundy, I seem to remember and Glouchester was the last claimant in the event sequence we have in the game iirc...
About alternative marriages I have already written and intensively tested (they seemed to work as expected!

) a few imo interesting events and posted here in this thread at
page 21, from post #505 to post #507.
If you wish (and what I warmly hope!) you can check them there and give some suggestions/comments.
I still haven't submitted them as in some parts they could be intended as too much fantasy for the agceep statement, maybe they should be meant for an alternative burgundy to be selectable at the beginning of the game...who knows?
Here I summarize the contents of the sequence:
ALTERNATIVE MARRIAGE OF MARY OF BURGUNDY
(about the (in)famous BUR_3597 action C which I have reported several times in this thread)
According to what was discussed here I have decided to use following pretenders:
- FILIPS VAN KLEEF (Philippe de Clèves-Ravenstein): you'll stay as traditional Burgundy (with French and Dutch culture)
- JOHANN OF NASSAU: you can choose to become Hainault and then Netherlands in 1559 (only Dutch culture)
- JOHANN OF KLEVE: either Burgundy or Kleve (both with German and Dutch culture)
and avoided the marriages with Gloucester, Federico of Naples, René of Lorraine as there are too much events involved and surely huge ahistorical consequences...
EDIT: ahistorical Burgundy ruled by the Valois-Cleves-Ravenstein dynasty (the default monarchs!

) or ruled by the Valois-Kleve dynasty will suffer the Dutch revolts.