If you have a way to plug 2 or 3 of the rebar holes - you should be able to get your PBC temps down to somewhere around 250F - maybe a bit lower.
That will allow you to smoke them on the grate without liquifying, or burning them. I use a small wad of aluminum foil as a plug. I have seen 1Bigg_ER use wine bottle corks.
I smoke mine for 1-1/2 to 2 hours.