I just looked at GRR - SCL business prices for October '22. Cheapest is now $2300+. Maybe 110,000 not so bad?
(EDIT: Just saw it was 110,000 for economy, nevermind!)
However, lots of time for cheap award/$ to come back....put the friend on other dates/times if you can't find same flights?
What about buying economy and using miles and copay to upgrade?