How to sort folding titles alphabetically?

I want to order alphabetically folded blocks of text according their
title, but without changing the order of the lines inside the folded
blocks. I want to order the blocks, but not the lines inside.

I am using a vim help file with the following syntax:

vim:ft=help:fdm=expr
vim:foldexpr=getline(v\:lnum-1)=~'-\\{80}'?'>2'\:getline(v\:lnum-1)=~'=
\\{80}'?'>1'\:getline(v\:lnum)=~'=\\{80}'?'0'\:getline(v\:lnum)=~'-\
\{80}'?'1'\:'='
vim:foldtext=substitute(v\:folddashes.substitute(getline(v
\:foldstart),'\\s*\\*.*',"",""),'^--','\ \ \ \ \ \ ','')

Is there any way using vim (or external unix tools) to do this?

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