it's possible java 1.0 (pre JIT, pre HotSpot, pre-gigantic standard library, pre-fancy-types) might qualify. it was simpler, but no one targets that anymore.
more than a technical argument i think you can judge how "bedrock" a VM design is by something like:
B = M / (U + 1)
where M is the number of distinct implementers and U is the number of distinct users.
you can tell the JDK/CLR are not very good bedrocks because is M is pretty small and U is gigantic. i would argue scheme is actually pretty good by this metric.