How to convert changesets to MQ patches

[Guido Ostkamp]

Hello,

I just read how MQ can help to maintain patches to third party software 
for rebasing to new revisions.

Question:

If I already have a standard repository created from some release tarball 
and have created some changesets (>> 1) regularly, is it still possible to 
convert these changesets into a set of patches that could be easily 
imported into a new repository as MQ patches?

Or alternatively is it possible to convert the (>> 1) changesets into 
patches in the existing repository and remove the already committed 
changesets?

Regards

Guido