New answers tagged door-frame
Your idea about the 1X6 on either side is a good start. It would give you something to fasten to, in a simple fashion on both sides, although the fastening would be minimal. You may need to increase the number of nails in the jamb to keep it in place over the long haul. Same thing if you use screws. When the 1x6, for a 6" wall, or if it fits, 1X8 for an 8" ...
They don't actually look that bad (at least to me from that picture) - you should be able to just sand them down, re-stain if desired, and then polyurethane / seal them again.
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