[RussWhite]

There's not much that can be added to the good advice Steve gave. I think your best bet is upgrading your strap wrench to all metal. The ones with a metal handle and a metal band with bicycle links are very tough. You could even slip a small pipe over the handle to increase leverage. If you can, work toward the bottom of the filter as that end is stronger and less likely to crush under the force of the wrench. Personally, I would not use the long screwdriver last resort as I would be afraid of that not working either and ending up with a mangled mess that would never come off. My last resort would be to remove the wheel which should allow lots of access and tool length to turn it loose.
I had a couple oil filters installed by Charles Atlas that took very long levers and in the end deformed both the tool and the filters, but got them off. The next time was much easier as I put them on with minimal torque. Those scary times of not being able to get something loose really stick with you. I guess I have been luck, my desiccant filter came off with just a big strap wrench and no drama. Good Luck!