Thank you for your replies!
@Waltron , I read an interview with Jack Winkle about Jack pines. Very informative. When you say treat it like a 2-needle pine, you mean like a single-flush pine? Or like JBP?
@Osoyoung, thanks! I will repot it in August, into a colander most likely.
@M.Frary, I know they are not very common as bonsai, but I saw its twisted trunk in the nursery, and thought, "Why not!"
Here is a pic of the tree in question. It is young. Approximately 30" long, with 1.5 inch trunk caliper at the graft (which is low).
View attachment 149080