I think it might be worth forking some demo board to try it for fun. I think it can lead to good reading practice and learning how to fight. I would like to try it sometime as well if anyone wants to with me and play free correspondence let me know.
Unfortunately I don’t have time the moment, buuuuut…
The BadukClub beta site can create matches for players on OGS with the sunjang baduk starting position. It could also pair the players and record the results and pair the next round. All the playing would happen on OGS, but BC would help organize the players based on what the TD set.
It wouldn’t be as slick as built in OGS feature of course, but if people would be interested I could add it to the development todo-list.
According to this SL page, Karigane was a strong sunjang player.
[Paek Nam-kyu, top Korean player of the early 20th century] played Karigane Jun’ichi in 1899, where he fell to a four stone handicap under Japanese rules and a two stone handicap while playing sunjang baduk
Karigane was pretty young at that point, about twenty. Park, though, was only around fifteen.
Park apparently died in 1970, born too early to take advantage of the Japanese outreach given to players like Cho Chikun (b. '56), Cho Hunhyun (b. '53), Kim In (b. '43) or even Cho Namcheol (b. '23).
I asked high-playout KataGo to play two games from the sunjang starting position (but with NZ rules and 7 komi). Black won the first game, the second (bottom variation in the same file) was a draw. Kata really likes the 6-2 point in these games. She played it once in the first game, twice in the second.