The VFS layer in SQLite is begging to be used like this. For a read-only implementation (where you generate the SQLite databases out-of-band and upload them), the code nearly writes itself. It's maybe hacky in the sense of "I had to write a SQLite module for this" but it's a very nice fit for SQLite VFS.
Yes this code was very straightforward to write and this approach lends itself very well to read-only databases of large datasets with no server infrastructure overhead. It's also "free" to host for the time being.
