We got a local exhaust place (they make custom exhausts) to open up the DPF can, knock out the innards and re-weld it back together so everything looks as normal. They charged £80 for that part. We then got the DPF deleted from the ECU and an economy tune on the car for £200. Straight away the car was not only faster, but it was considerably more economical. The only thing is insurance. You should really let them know that you have a modified exhaust and have had a remap to keep things right.
Our company charged us £30 more on the premium. They also told us that had the remap been for performance and not economy that the premium would have gone up by nearly £100. Total all in including higher insurance was £310.
The fuel savings alone have more than paid for the higher insurance several times over and the knowledge of no more "Engine Failure" warnings about the DPF has made my wife a happy driver again!