text fonts and centering questions

I'm designing a template for "date disks" for watches with numbers
from 1 to 31 or "Mon" to "Sun" arranged in a circle. The texts are
centered on sketch segments which are offset from radii so that the
radii go through the middle of the texts.
My first question is : how can I quickly change the font of the 31
texts ? I could change the document's font, but it is tedious. I
found no way to select all 31 texts on the same sketch at once. Did I
miss something ?
My second question is : how can I link the baseline offsets to the
font size, so that changing the font will automatically reposition
the texts centered on the radii ? I don't want to "dissolve" text
because font must be changeable...
My answers to both is "API", but I'd make sure there is no simpler
way before coding... If there is none, I'd fill one more enhancement
request...
Philippe Guglielmetti - www.e-systems.ch