Sounds unusual that they don't want you to re-apply especially when you got recommended. If you are happy to accept one of the other services I'd change your preference and then go for the Assessment Day/OSB again. Keep in mind the Navy to both BFTS and 2FTS so you'd still get your wings and have the opportunity to transfer if you did well enough, might be worth a shot. I'm not an expert but that sounds like a reasonable idea if your keen to fly.