If the shirts will ever be produced, the design also depends a lot on how they will be made.
Sieve printing could be a possibility if you wanna have very detailed color printing.
Flock foil is way less expensive especally for low production values, but you cannot have things like gradients in it and you are restricted to a basic color palette.
So your Version 1 & 2 would be possible only in sieve printing (additional color white would be needed too) while the 3rd version could be made with flock foil (allthough it will be a pain in the ass to take all the little bits and pices out of the flag).
Or, becourse it's a white shirt, it could be done with Ironing Images, it's the cheapest version but the images will fade to grey very fast.
Unluckly, noone announced how the t-shirts will be made.