I was running out of ideas for how to speed up such large games. And for the variants I had in mind (14x14 and 16x16) the ideas I already discussed seemed sufficient for making those playable. A fundamental issue is that it takes at least as many moves as you have pieces to move all your pieces.
I've always liked the concept of the transport pieces in Jetan Jeddara as a way to speed up large games.
I've always liked the concept of the transport pieces in Jetan Jeddara as a way to speed up large games.