I suspect it will be an uphill battle. It varies between insurance companies. Here is an old thread on the topic.
Some insurance companies have insulin pump supplies and CGM supplies on both DME and pharmacy lists, but not very many. If the Omnipod is on your insurance formulary you technically should be able to get it as a pharmacy item, but you may find it difficult finding a pharmacy that will get it for you. But getting an insurance company to change their formulary? I think that would be difficult.