I do not have "the" answer to your specific question.
The Vit C issue involves connective tissue repair.
In general advertisements encourage us to take
supplements that help "repair" tissue damage.
Vit C and Chondroitin glucosamine encourage connective
tissue repair. Well, DC sufferers already have an
over-active repair process. The thinking is: why pour
gasoline on a fire? Conversely, anti-oxidants may be
benign or even helpful (Vit B series.) No one knows for
sure. Anecdotedly (stories,) it seemes resonable to
avoid collagen repair modalities. Anti-oxidants might
be non-contributary, if not helpful. No one knows with
certainty to the best of my limited knowledge. I think
that this forum, the BTC study, the French "needle,"
and a knowledgeable hand surgeon are the best avenues
of "managing" the disease. I hope collagenase works out.
I await gene therapies. Meanwhile, there is no cure;
(IMO) there is no esoteric naturopathic remedy. Avoiding
high dose Vit C and the Chondroitin complexes sounds
prudent (although unproven.) Hand surgery is a necessary and
appropriate treatment in some, not all, circumstances.
If one focuses on third party payment, health insurance,
I, personally, feel all is lost. Focus on the extent of
debilitation, become informed, pay for consultation, read this and other web sites, weigh the possibilities, chose
the best option for yourself. Do not get "talked" into
anything without researching the subject. Me, I will opt
for NA when my pinkie gets 30-45 degrees. If Collagenase
is available by then, I will consider that. NA sounds
quicker. Both are treatments, not cures. Hand surgery
sounds: unpredictable, expensive, slow healing, and may
limit other options. Gene tharapy may be decades away.