You can simply plug the outside sensor bung and weld a new one on the inside where you want it.

The only potential issue would be the TTI ceramic coating will get nerfed around the newly welded bung. I've touched my silver ceramic coating up virtually invisibly with High temp BBQ paint.

I've since painted my entire exhaust system black with VHT High Temp paint. The ceramic coating from TTI is great as a substrate for high temp paint. VHT's High Temp paint is amazing stuff, it holds up well and you can touch it up any time you want.