Basically, the same parent premise - You start from one country and can pick from a bordering country with one free pass to switch continents, same max 2 country rule.
However, last time we picked players who were born in the country we landed in. But this time, we pick players based on their club careers in any professional league played in that country. Only their club performances while playing in the league of that nation would count. Can extend this to include NT performances of the player while he was a part of the league in the country being picked from, though that would be complicated during tournament.
e.g. I start at France and pick Neymar - so he will be judged on his performances for PSG and nothing to do with Santos or Barca. Then, I move to Spain and pick Luis Ronaldo - so only his performances for Madrid and Barca count and none of Inter etc.
Remember, we had the three league draft which had players based on league performances in three specific leagues. This would be a difficult version of that as everyone would have players representing 6 different leagues in the team.