Possible to trigger autovacuum?

Is it possible to launch an autovacuum from within an extension?

I'm developing an index access method. After the index gets built it needs some cleanup and optimization. I'd prefer to do this in the amvacuumcleanup() method so it can happen periodically and asynchronously.

I could fire up a background worker to do the job, but it would be a lot simpler to call please_launch_autovacuum_right_now();