This is the main issue, at 2.1 million there are many many better options in new and used, compared to JDM Alto. Otherwise at previous price, JDM Alto was amazing. I am sure about the build quality, ENE-Charge and other advantages.
About parts, JDM Alto is also a pretty common sight, doesn't that mean parts should not be an issue? Parts are plenty for common JDM imports like Mira etc.