Sorry for the late response.
I love the suggestion - nothing more I can add. I would even make it more then 3 games if possible but some may say I am taking it too far.
I have one question regarding this issue - B3 has a TL, playoff as well (even though it's not enough) - why do we allow buying players right before the cup final?
I see many teams that get far in the cup quarter final and above just buy and sell players in order to win the cup. before the cup final you can see teams buying cheep monster 250K and above C and just play 3 big men look inside and kill the match...
I think it's very easy and straight forward to allow players that played prior to the quarter in you team to play in the Quarter - Semi and the Finals...
"Did you miss me??? - "With every bullet so far..." Al Bundy