Hi pmperron.
That’s great news! Funny that you mention linen, as that was just the material I was going to suggest. Is it possible for you to purchase the linen itself and then pay someone locally to dye and sew it to your specifications?
Lyocell (wood pulp), bamboo, linen, silk, wool, horsehair are all ultimately good moisture-wicking materials for bedding.
For moisture-wicking sheets, you may want to read this sheets/bedding thread .
I hope this helps.
NikkiTMU