I use whole bales and just let the birds destroy them, 3-6 months I clean it out and use it for my garden. Green chile really seems to do good with all that extra fertilizer
Other than the straw bales you can try 1/2-1 inch diameter roosts if need be, I built a couple for my heritage birds and they loved them our BB birds never had the balance to use them
Because they get to be too heavy for their bodies BBB or any Broad Breasted Turkeys don't roost very well, but you can put a couple roosts down low so they can get to them