If you know of any Tig welders,here's some aluminium rod,3-32".
(https://i.postimg.cc/BnX8NVvx/IMG-20250411-120959.jpg)
Very pliable, bends easily by hand and holds its shape.
It's slightly oversized compared to the 1/24 roll cages, but if no other choice, may just work.
If you have a Harbor Freight or similar store around, they sell a small amount in a plastic tube about 2-3 foot long for about $15. Make sure to get aluminum as it also comes in various types of steel.
Thanks guys