There is a tendency to use juniper graft to a tanuki. But junipers really don't fuse well. Their bark does not readily roll over the grafted wood. But if you secure the scions well, they do make nice Tanuki.
Maybe use a shorter needled pine, like Pinus leiophylla, since you like sourcing unusual botanical material. Pinus radiata might work, but its rapid growth rate might get away from you, needles can be as short as 3" but they can get to 6". JBP could work.
Tanuki made with broadleaf trees have been done. There was a Tanuki Ficus shown at a show in Chicago 3 decades ago that fooled the show judges, they almost gave it best in show until they found out it was a Tanuki.
So if you have a species you like working with more than juniper, feel free to try it for tanuki. Though Juniper is the "proven, tried and true" more likely to be successful route to a Tanuki.