Don’t use an ORM at all
Everything sucks. Maintaining a fork of LiteSQL sucks. Using odb sucks. Having too many dependencies sucks. Relying on someone else’s code sucks (when that code is not perfect).
So, just write our own ORM-like code.
Should be simple enough: only (very) simple SELECT and INSERT statements need to be supported (no join, etc). And only support sqlite3. The only issue is schema evolution. But as long as we only add new columns, it should be pretty simple.