I agree with Jenny, I would probably get it done by someone who does it a lot. I had my trach shave done beforehand as well and have (am having) no issues. Initially I thought it may be better to have them do it at Yeson, but on second thought I don't imagine trach shaves affect the voice in most patients, especially if done by an experienced surgeon. I guess it depends on how prominent it is. Having it done by Yeson they'd probably be more concervative, whereas, getting it done by someone else may not.
It's a tough call though.