I don't know if you will get an answer here. Try asking to SymphonyOfNight he might be only one who knows something about this. Otherwise there is development section at the home page of this website try posting there. Good LuckI'm french and I can't find any info even in english about tk17 to import custom rooms the only site I know was mos garden which closed when I started to learn tk17... I don't speak english and it's hard for me to find info but if among the people who read this message and have the motivation to search I would be infinitely grateful and it would allow to have another game using tk17, as a player I love "my new life" but it's essentially for the models, this game has too many bugs and I would like to see more games of this type made under renpy...
I won't spam this post 50 times, but if one day someone reads this message and has the solution, even in 1 year, don't hesitate to contact me thank you and good evening
P.S - If you make the game don't shy away from sharing it with us all.