No, it is not a good idea.
Good ideas take the whole in consideration. And when you take that same whole in consideration, you'll see the multiplicity of possibilities a warring nation has to deal with, begin to reach our human and technical limits. To a player, this can be balanced by creating ways to disable or shorten those possibilities. "Parachuting" ideas will not solve it. It will only lead to more confusion.
This is valid to everyone who offers suggestions and even more to those related with the war engine:
Gain experience. Have practice. Know the environment you are changing.
In your case, you should war several times, in several conditions with several different players.
You must also make sure your proposal is in line with the ideals of the game. To what changes and functions are guided towards. Those, for now, are being refined by me and I can tell you, this suggestion does not pass. It doesn't because, and I repeat again, it adds greater complexity to an already extremely complex realm.
What we may see in the future is actually the opposite: the simplification of the war engine. It is far too complex. Its consuming too much processing time. Its complexity makes it particularly susceptible to bugs. These issues need to be addressed first.