A computer-based auction system can make trades easier and safer. It can even allow bidding in fractions of a voter's weight. One rep might, for example, bid to trade half a vote on a hot issue for a whole vote on an issue with less demand. FutuRule.htm includes a very speculative way of ranking priorities that discourages vote trading as it gives a voter 1 vote on an average priority, extra weight on his top priority, and less than 1 on low priorities. Combining agenda rules with preference ballots will require experience and judgement.
Democracy needs a few groups to begin that experiment.
A good synthesis would improve daily decisions by hundreds of councils. Some legislators, particularly those accustomed to ruling majorities, may require a synthesis of agenda rules with preference ballots before they will consider ensemble elections because those lead to open majorities. They may fear an increase in deadlocks, and in killer or freerider amendments if old rules of order are used when there is no ruling majority. Those are common problems in open US legislatures.