I do wildlife gardening in general (Baltimore area) & have a bunch of host plants-- all three of our local milkweeds as well as a bunch of other things. I’m trying to get a good patch of Turtlehead going for the (possibly not even around here anymore, but we gotta try!) Baltimore Checkerspot, but so far that’s not doing really well.
Have you checked out the Lady Bird Johnson Wildflower Center? They have lots of awesome resources, especially for Tx. They’ll most likely have a good host plant list if you want to plant for other caterpillars too.
(also, are you far enough south that your tropical milkweed doesn’t die back over the winter? There are a lot of PSAs going around about that carrying over parasites and not being good for the caterpillars)
Yay for planting to feed other species!