This is a brilliant idea and I've had the idea for gathering the worlds spiritual texts in a similar fashion.
One question I would have, why not put the extracted English txt contents onto github or some other repository? The API and MCP are definitely awesome features, but providing an LLM ready repository seems like it would be very useful as well. Your service then still serves the purpose for original scans/images/illustrations but the bulk of the content is then immediately searchable by an agent locally using the standard cli tools (grep/rg, etc).