a member can not set up teams for variants. True, most variants probably would not have enough interest for five teams, but there would probably be some exceptions, for example, a backwards capture einstein might be popular enough for teams, but it is currently not an option.
A way to go over the system, would be define a fixed number of boards (say 4), limit the number of teams, so that the UTs would be one group only and create a UT for each board. Then just sum up the results at the end. Sobral1919 would probably be a participant in such a backward tourn.