Have you tried the arm movement technique? I recall years ago there being some success at removing blocks by thumping one's thigh in time with the syllables or some such. Difficult when flying, but it shows that there is a chance the technique could be modified.
I have heard before that the fright of an emergency will remove the problem for a time.
You may think I'm kidding, but I'm not. Try thinking of your wing being on fire or some other extreme emergency, and see if it improves your speech. Once you know there are tools to get a handle on the problem, many of the issues just might go away.