How did your arrive at your RI conclusion? Was there an necropsy done or are you just guessing that it was an RI?
Seems like it's more your fault than the bedding's if your snake is feed on it and eats it with his meal. Seems pretty easy to me to either feed in another container or put down something to prevent the ingestion of bedding.
Also, a snake who eats his bedding is one who has weeded itself out of the genepool and with reason. If you're not smart enough to know how to eat on the ground, you should not be eating on the ground.
So, are we just supposing here or are there actual facts in the mix?