What is your suggestion?: Make 1-3 more Puro Puro areas, exactly the same as the current one. I'm suggesting this over instances because you cannot instance it in OSRS, but you can hop worlds.
The option to go to Puro Puro 2/3/4 could be added to the Teleport Wizard menu, or to reduce clutter, it could be added to Elnock Inquisitor, the NPC inside of Puro Puro.
Is this in OSRS?: Yes, each world has its own Puro Puro.
Has this suggestion been accepted already?: No.
How would this benefit Alora?: Multiple areas for Puro Puro would benefit players camping for rangers, dragon arrows/darts/bones, and clue scroll gear for fashion-scape. Currently with one area if there are two people there it becomes 50% slower, which is insane because with some world hopping and proper management you can claim 4-5 worlds in OSRS.