It's not surprising that the idea of Shogi with a deployment stage has appeared before. Interestring to note how Unachess has several options for a FIDE set and board but only one for a Shogi set and board. What Unashogi lacks is my proposal that Kings must be placed first, a rule that leads into a theoretically possible Shogi position (although in reality players would be unlikely to hold all there captives in Reserve for so long) so that thereafter Shogi rules can apply as standard.
As I write a further thought has occurred to me. The Unachess principle could be used for deploying a set on a board for which it was not designed - a FIDE set on a Shogi board, a Carrera/Bird/Capablanca set on a Xiang Qi board, a Chaturanga set on a Diana/Haynie's Primary/Los Alamos board, et cetera. Of course deploying a Shogi set on a board with more or fewer than 9 ranks would require a definition of the promotion zone, likewise the River and Fortress for a Xiang Qi set.