Also being a blind Twainian, I might be able to point you in a few
directions to find sources.  As you know, the Library of Congress and other
tape book libraries are very slim with their Twain offerings, but I've found
it helpful to contact my local agencies that typically share a radio reading
service with a taping service for the blind.  If you're in a rural area,
this might be difficult, but if you're near a decent sized city, volunteers
are often available to put texts on tape for you.  The process is often
slow, but that comes with the territory.

Many Twain sources are available on computer disc, but offhand I don't
recall if CONSPIRACY numbers among them.  Hopefully, Kevin Bochynski can
give you more information when he gets back online (he's going to be
involved in other matters a few days.)  you might write him directly next
week. He, or someone else on this list, might be able to send you files they
have in their archives so you can work with them in your computer.

Most text sources I've collected are the works themselves without all the
valuable notes and scholarly apparatus that distinguish the UCAL editions.
If you have a scanner, you'd be best off by getting the print editions to
both have access to the supplementary materials and be more able to work
with the text in your own writing work.  This way, you can cut and paste
material from the scanned text into your own work with the proper
pagination, spellings, etc. from the authoritative texts.  I've found this
much easier than dealing with tapes.  The same holds true for articles or
books not yet available online.