I don't think that would help enough to prevent the impasse. The defending pieces also don't go mostly forward. When you build a fortress of Tokins in the opponent's camp in Shogi, the Tokins are looking away from the direction that the attack is coming from.
But you have a point; it should be established by play testing whether impasse in this variant would be a problem that begs for a rule to solve it.
I don't think that would help enough to prevent the impasse. The defending pieces also don't go mostly forward. When you build a fortress of Tokins in the opponent's camp in Shogi, the Tokins are looking away from the direction that the attack is coming from.
But you have a point; it should be established by play testing whether impasse in this variant would be a problem that begs for a rule to solve it.