What an interesting question! I reckon you will need to pool ideas to choose your answer, because I very much doubt if there's been any research completed.
Initial thought is that sweat is salty not sugary. I would imagine you'd be ultra organised, to facilitate a rapid dry-prick-measure without distraction.
You could take your meter to the surgery to do synchronous venous/capillary measuring to compare results.
You could discuss with the DNS about 'alternate site' testing. I think a fruitful Internet search on alternate site testing could be achieved, with a good image search.
It is frequently advised to warm hands to obtain a better blood sample, but this may exacerbate your problem. Do you think experimenting with hand temperature might alter the rate of sweating?
Deep down, I feel the impact is quite probably minimal. No alarm bells have rung in my mind. But as previous you would do best to assimilate from a few people's thoughts.
By the way, have you already tried iontopheresis?
Good luck! Do let the forum know if you come up with a definitive answer.