The Debian installer manual says that you can access rescue mode with 
accessibility. Quoted text:
# # #
5.2.9. Expert install, rescue mode, automated install Expert, Rescue, and 
Automated installation choices are also available with accessibility support. 
To access them, one has to first enter the “Advanced options” submenu from the 
boot menu by typing a. When using a BIOS system (the boot menu will have beeped 
only once), this has to be followed by Enter. Then, to enable speech synthesis, 
s can optionally be pressed (followed again by Enter when using a BIOS system). 
From there, various shortcuts can be used: x for expert installation, r for 
rescue mode, or a for automated installation. When using a BIOS system, they 
must be followed by Enter.
# # #
Okay, that's great, but what about a UEFI system?
I installed Debian, and I was watching the braille display during grub 
installation. It said Running 'grub-install dummy'
Why is it running dummy instead of /dev/sda1 or whatever the efi partition is?
When booting the installed system, what comes up is a grub rescue prompt.
I thought I would try this fix:
https://superuser.com/questions/1154866/unable-to-install-grub-in-dummy-on-debian-stretch-in-dell-precision-5510
Can you still insert your Deibian installer flash drive, press tab, and type 
brltty=auto rescue/enable=true when it comes up?
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