Bridge grafting is basically life support and if it takes it can be many years before the tree will recover and you have to hope that it doesn't get injured again.And even then it might prolong its life for a few years but not be enough to save it.

And usually if more than 75% is girdled, prognosis is not good. Depending on where it was girdled, chopping it below that area and letting gives it a better chance of survival. Or if it is young replacing may be a better option since even bridge grafted will not thrive until the bark and cambium slowly regenerate.

You can look online about general grafting and bridge grafting, I don't think there is anything specific about grafting when it comes to oaks.

Usually plants in the same genus are compatible (so red and white should be)...but compatible does not always mean thrive.

If it is bridge grafting best would be white-white or red-red...even better would be to use suckers or 1 year old branches as scions from that girdled tree since it would be the most compatible. Would be best to do as much bridge grafts as possible since not all will take, and the more that do will be more and better nutrition for the tree

Thanks AW. After doing some research I found that that it would not be worth my time and effort. Basically they said the same as you.