None of the four bishops (nor the SSPX bishops) has an apostolic mission (ie., jurisdiction), which would be schismatic.
As far as getting in touch with him, I’ve never heard of any member of this forum struggle in that regard, since anyone who REALLY wanted to get in touch with him need only ask those known attendees (eg., me, Matthew, Mr. G, and a half dozen other regular posters here) or post a thread seeking contact info.
As regards helping out other priests not connected to the SAJM (of which BZ is a member), I believes he does what he can, when he can (ie., He either needs to suspend services to his 4 regular chapels to go help someone else’s chapels, or, find temporary replacements to cover his own chapels).
Eventually, as vocations to the SAJM are ordained (or vocations to allied religious congregations like Santa Cruz or Avrille), the current situation will improve, but at present BZ has only 2 priests to help him.
It’s a good reason to pray for vocations.