Troop trade

I have never been in this section of the forum and I wonder how many would notice this idea request but here it goes. So basically it's about trading troops. Let's say you have 15 minutes till your war ends and you need to attack ASAP. You just queued your army and don't have enough gems(or don't want to spend that much) to instantly finish training. That's where troops trading can come into play. You can simply go to trading page and see who's selling troops. Prices will depend on the seller and you will pick the one which is cheaper. Of course, the prices will be a little higher than the original training costs(else the seller won't make any profit on its own).

Sounds like an awful lot of work to solve a pretty no existent problem that if actually encounter already has solutions, i.e. gems