Sorry about the honey--you obviously have researched and know your stuff. So I can't recommend any of Burt's Bees stuff. Yes, in most hands the injections are fairly ghastly.
You don't smoke, do you? If you do, stopping will help perhaps. Spicy foods should be avoided.
Does anyone else in your family have this issue? Anyone with Sjogren's disease? Are you on any medications that can do it?
I know for sure you keep from licking your lips. Is it worse in the morning? are you mouth breathing all night? Can you apply the grapeseed oil nightly and do the grapeseed oil/warm poultices to your lips several times a day? If you are mouth breathing all night, especially with snoring, this certainly could be the problem.
Is this all over your lips (angular cheilitis) or just the corners? Has your dermatologist tried treating for fungus? Tested for iron, vitamin C, and other B vitamins (esp. B1 (plasma thiamine) or B6 or B2 (riboflavin?)
Have you tried a withdrawal diet as you certainly seem to be allergic to lots of food-based things: lanolin/honey? You could try that for two weeks to two months and see if there is an improvement.