This is the element. It would be having a place where debates are chosen, ideally without the involvement of the party whips, and having a place where speakers would participate without involvement from the party whips.
The goal, ideally, would be to have this as the beginning of an experiment, to see if having a space that was free of party might spread some ideas cross-partisanship into the other place.
I believe there have been complaints about rising partisanship in debate in the Canadian House of Commons for most of the past century. If you read the great text on Parliament, The Parliament of Canada by Ned Franks, written in the late 1980s, the words sound like they could be taken from today.