WebSQLDB isn't really a "standard". The standard is "whatever version of sqlite safari happened to ship with" which is really not a tenable long-term solution.
Sure it is. Pick a version. Call it the spec and fork SQLite if necessary. You can't possibly argue that this would be more work than inventing a new, untested data storage model from scratch. This approach is exactly what ran the W3C aground in the first place.