Join Date: Dec 2015
Location: The Very Tip of Lake Michigan
For future reference, you can cut the plug out using the same jig you used to make the pocket hole. It's not a lot of fun and takes a bit of finesse, but it's doable.
Use an old bit without the starting tip or a regular twist drill bit. The plugs rarely cover the head tight so you will still be able to get purchase on the screw head.
Replace with stainless or shorten. Re-plug.
Another $000,000,000.02 worth of advice,