Per TRAICY (https://www.traicy.com/posts/20230616271983/), there will be two airside IASS lounges opening on July 12. The article (only in Japanese) says those lounges will accept PP and will serve drinks and food.
IASS does not have a press release yet, so hopefully TRAICY is accurate and they will accept PP.

Even if the lounges are on per with the KAL lounge, it is better than nothing for those departing from T2.