Using the rotate of the Edit Frame for each letter don't make the trick?
It's very speedy click and rotate!

And maybe there is a Script for rotate all selection in one click ;)

I come back in few time :)

Yes it's "RotateObjects"!
I come back in few time :)

Ok it's here ;)

http://moi3d.com/forum/messages.php?webtag=MOI&msg=4339.1
and scroll the page for the update!

So all your text will be rotated in one click! :)
Maybe some alignment will be necessary!