Just to be clear I was implying that Francis's branch i.e. children would be whom the contract with Vladislaus for Anne & Louis would likely be arranged for if they are age appropriate
Bianca Sforza is too old for Francis by about 9 years so I don't think she'd be a candidate for him. If anything I think Max would arrange initially for Francis to marry Anne of Brittany she's older by 4 years.
Problem is Charles VIII of France won't allow it, still have the Habsburg encircling issue. So who is considered after the engagement is broken off
Margaret Tudor (b. 1489, OTL queen of France)
Elizabeth Jagiellon (b. 1482, like @Sventious21 suggested)
Helena of Moscow (b.1476, Frederick III considered marrying her for a Russian alliance agx the Jagiellons, the Tsar suggested Max instead, if Max declines they can always put up Francis instead)
Charlotte of Naples (b. 1479, unlikely but interesting)
One of his Bavarian cousins Sidonie, Sibylle or Sabina
This would free up Max to marry Bianca earlier if at all( Ludovico of Sforza might push for the an alliance with Maximilian via the marriage which would now be earlier than OTL so both could attack Venice; this might remove his invitation of the French that started OTL Italian wars)