a11y in live images including the installer

Hi, some questions about Debian live install images please:
1. I've noticed that orca is among the packages in the images. Are they 
accessible and usable with speech?
2. Is the Calamares installer accessible? If yes, does it allow me to 
customize my installation to the same level as expert mode?
3. If Calamares isn't recommended for use with speech, is the standard 
text-based installer available inside the live image, or do I need to 
use netinst for that?

thanks,
Cleverson