There actually is a way to target them but its not Horsemen exclusive. Requires money to do so and no guarantee that you will get one your after.
Yep more RNG I'm afraid
I bought 3 and didn't get a single one I was after. It's not ideal but the option is there for the Gotta Have It All collectors like myself.
I would like nothing more then a crafting system to target a copy of Gards Avatar for one of my PC accounts so I understand where your coming from. I really don't think it will work like that though and I expect more RNG to be involved if a system is ever created.
I wish you luck @Maxx and hope RNG smiles on you soon during a nonexclusive week. Best of luck