I also have a list of candidates but have no idea who they support. I have no idea how to contact the Trump campaign for advice.
My guess is the well-organized campaigns will put that info out closer to the vote. However, I think last time Gingrich and Santorum didn’t even get enough of their own loyal delegates on the ballot in many districts. It sounds like Trump and Cruz got their delegates on the ballot in Illinois where it has a similar system, but a study showed Trump lost 3 delegates because they had foreign-sounding names and his xenophobic base decided to pick other names.