[EM] Proportional election method needed for the Czech Green party - Council elections

[Juho]

I think there are good and well tested single-winner and proportional  
multi-winner methods that the Czech Green party could use (like  
Condorcet methods and STV). For the election of president (P) and vice- 
presidents (VP) there maybe are no good existing solutions (see  
requirements below), so we may need to propose a new one (hopefully  
just a combination of old well tested tested methods). Here's one  
proposal for your consideration.


Based on the discussion my understanding of the requirements is as  
follows (please correct if wrong).

- P and VP are regular members of the elected board (or council)
- it would be a good idea to elect a centrist P (one that appeals to  
all, not just to the biggest grouping)
- VPs should be elected in a proportional style (the strongest group  
shall not be able to take all the P and VP seats)
- the board (including P and VPs) should be proportional
- the board election should be based on voting individuals (not named  
sections of the party or their nominated representatives)
- board, P and VP elections will take place at the same time (=> one  
can use the same ballots in all these elections)
- the method must be easy to understand and also well tested where  
possible


Draft of a method:

- collect ranked votes
- use Condorcet to determine P (Condorcet tends to elect a compromise  
candidate that all voters find reasonably good)
- use STV (using the same ballots) to elect the group of P and VPs  
(some special rules are needed to guarantee that the already named P  
will not be eliminated in the process but will be elected)
- use STV (using the same ballots) to elect members of the board (some  
special rules are needed to guarantee that the already named P and VPs  
will not be eliminated in the process but will be elected)

One could elect P and VPs also later. In that case one could elect  
them from the members of the (already existing) board. Otherwise the  
process would be similar.

If one needs to elect new members to the board to replace old ones one  
could use the old ballots + special rules that will not eliminate any  
of the sitting board members.

Does this work? Is this practical? Can this be considered to be  
understandable and well tested? Are there some strategic  
opportunities? Does this maintain proportionality as it should? Any  
conflicts with the expectations and needs of the Czech Green party?

Juho