Gotta go with the merrilliana hybrid possibility. It's really nice and once it gets some size and gets established, it'll be a beauty.
The long red tendrils make me think thorelii, but bellii has long tendrils too! The peristome shape makes me lean more towards (thorelii x merrilliana). I believe this hybrid was made years ago in Japan.
It's not pure merrilliana. tendrils aren't right.