Secondary Open Seats
Let the game host add another type of open seat with different prerequisites. Allow at least 3 types in a game. Make one of the prerequisites: from clan XY. If you are from clan XY and there is a game with an open seat with a prerequisite of being from clan XY, make the game pop in your games as if you were invited. Let players turn off the latest mentioned feature. You can hide some of this behind membership to increase its value.
On diplo games, there are usually big slots which require more experienced players with lower boot chance. Currently, the host has to switch players manually, which is not only annoying for the host but can be a negative experience for the switched player. Making such slots an open slot with heightened prerequisites would solve that issue.
Prerequisite from clan XY would let the host make a team game, where anybody can join team A, but team B is joinable by their own clan. Or make a game only joinable by own clan. This would increase the value of clans.
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Hry Bory commented
In my clan I am trying to organise clan-only events, but it is hard to find a good way how to invite the correct number of people to the game while making sure to replace people who decide to decline. After presenting the idea in https://www.warzone.com/Forum/641712-clan-slots I realized that the diplo community would profit from a special slot as well. I believe this feature would be mindblowing.