Go with Tape Ted or Thin Finn. Tight Long John would be more like Tepphar IMO. Based on what you said, i would go for a pair of Nudies in 29x32 since they stretch. These two cuts would be the closest, as I too wear Thavar/Shioner/Thanaz. They'll be snug at first but will stretch within a couple of wears..
Hope that helped!
Thanks man, I appreciate the help!