A clash against his native Fiji in Belfast a week later is also part of the Baa-Baas schedule.
Koroibete would be much better prepared should he then join the touring Wallabies for their non-cap game against the French Barbarians in Bordeaux on November 24.
The exposure to top coaches and players is just what Koroibete needs before he tackles a big pre-season with his new club the Melbourne Rebels.
The Baa-Baas move is not without precedent.
Mat Rogers, another code-hopper, was drafted into the 2001 Barbarians for a match against the Wallabies in Cardiff for exactly the same reason.
It gave him a running start at playing for the NSW Waratahs the following year.
The Baa-Baas is also likely to be an avenue to give other fringe Wallabies, like hooker Tolu Latu and wingers Luke Morahan, Sefa Naivalu and Henry Speight some more November rugby.
Former dual intentional Lote Tuqiri believes Koroibete's speed and bumping runs will make him "a success 100 per cent" in rugby.
Cheika is a strong advocate for the benefits of the National Rugby Championship and will free up to seven Wallabies to play in this weekend's semi-finals.
No names have been confirmed but it is almost certain Morahan (Perth Spirit) and Scott Fardy (Sydney Rays) will spice up Sunday's semi-final at Sydney's Pittwater Park.
Minor premiers NSW Country (Nick Phipps and Latu) will likely be strengthened to face Melbourne (Sefa Naivalu and James Hanson) in Newcastle on Saturday.
Koroibete had an exhausting year with the Storm so a post-grand final break is what his body needs more than anything.