They would need the approval of Concacaf itself and it's not gonna happen. They gonna win lots of money when their National teams (Trinidad LUL,Jamaica LUL, Panama LUL) play teams like Brazil or Argentina, but in the long run they re gonna lose lots of money coz Mexico and USA will lose automatic qualification .
If you put like the top 8 teams of Conmenbol and the top 8 teams of Concacaf play each other for 3,5+5,5 = 9 spots, and just start the qualifiers earlier. We re most possibly gonna see 7-8 Conmenbol and 1-2 Concacaf team.
I know anything else other Conmenbol Uefa is irrelevant for title winning but well it would ruin the WORLD title as a total.