It is possible to set up an arrangement using an MEP model.
If there is a connection between the churches, can be set up more like a denominational plan: One plan, with "members' joining it.
Typically in this type of arrangement, the Plan is the same for all with regards to the investment menu, etc. and then each "member" can determine the participation parameters plus answering the "Who gets what" and the amount of the church's contribution.
Hope that helps.
Bruce Bruinsma