I have the CrossMac filesystem installed and a working ZMC: for the old SCSI Zip drive on cybppcscsi.device (or cybppc.device, can't recall which OTTOMH.) Would just like Poseidon do it for me.
*sigh* Admittedly, I haven't looked through the docs. This may be a case of RTFM and I welcome the trout slap if that's the case.
No, there is no easy way to do that with Poseidon for 68k. MorphOS would go through the mount.library, but on 68k, it relies on custom filesystem detection routines inside the massstorage.class -- which doesn't have support for the rather exotic HFS formatted media. Sorry.