Yes, I currently have a quartet of four bunnies in my house right now, and we do tend to try and bond rabbits into trios in our sanctuary so that the remaining rabbits have friends when one passes.
1.) you're going to need a pretty huge cage. No animal is going to get along if they don't have plenty of space.
2.) all of the rabbits need to be spayed or neutered.
3.) this is going to take time. You're not going to be able to dump them all in on top of each other in one afternoon and come out with a trio -- this will be an ongoing process that may take weeks or months of work.
4.) you absolutely need to have a backup plan in case all or none of these rabbits will get along with each other -- can you do three cages?
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry