That's a great solution for the meltagun. It took me a minute to figure out just what you did.
Daemon Princes can take shields...A shield is considered to be armor; hence a Daemon Prince that has the option of Chaos Armour has the option to buy
Daemonic Gifts at all are honestly fine; but i will agree with you that at a point your are overpaying for certain abilities and properties....
Multiple rumours from good sources put it at some time next year. Add to this new rules in the ET regarding combined characters, and a clear buildup towards