Halo Infinite is getting a fanmade mode that has much in common with Helldivers 2 - it's also called Helljumpers, if you had any reservations about where the inspiration came from - and it has me ...
You can see it in action below. Halo Infinite, as it stands, won't be switching to Unreal Engine 5 either; it'll remain on Slipspace, and it'll still be supported through more Operations and Forge ...