Might I would suggest a slightly different path.
Install Quasijarus on a more traditional vax processor with RH style disks [RMxx/RPxx] on the simh. Then add a virtual RZ SCSI disk to the simh system [although you might not even need to do that - as simh just sees the disk as a linear file of blocks without any geometry]. The trick is to make sure the virtual disk is set up so that you have a working system/booting system on the virtual disk when changing the processor type to match the VAXstation. Then just DD the image to a real SCSI drive and move it to the VAXstation.