What size enclosure have you tried? And how long for?
I wonder if there's anyone close to you who might be able to try for you. Some of the rescues offer a bonding service.
I don't have huge amount of bonding experience but the only two I tried who looked like they really wanted to hurt each other (as opposed to a bit of chasing or fur pulling) only got worse the more I tried. Before them I believed with enough perseverance you could bond any two rabbits but now I think some bonds just aren't meant to be. I do believe even if they won't bond that they will both be getting a lot out of living next to each other and won't be as lonely as if they were the only rabbit in the household.
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