Not Ranked
I don't know if you have enough wood to do this but one thing would be to counter sink the bolt heads. If not that, then got some good glue and glue the heads to the wood and let it set until it is hard. If that doesn't work, take a small piece of steel and bore a hole through it that the bolt can go through and then weld the bolt head to that and fasten the steel strip to the wood with small screws.
Ron
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