The cheek pieces are similar to what Kerry Kelley sells as the "bogey" cheek piece in his barrel horse bit line for custom order.
You could maybe have them modify, twist and put rings in for the bridle loops. You can cut a chunk of rope for the nose piece.
A custom hackamore from Kerry is about $800.
But I bet you could get the cheek pieces and find someone handy to modify.
There is another guy in TX who made my banana gag bit for a steal but he has got popular recently. Not sure of his prices and wait time now.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.
PLAYBOYS OKIE CODY "HOOEY" 10/21/2019