DECmate II disk image tooling?

[David Schmidt]

I have some disks that look like they're from a DECmate II computer,
standard RX50K drives.  The disk images all look like they're a mix of
12-bit (OS/78 or OS/278?) and 8-bit all on the same media.  I can't
convince PUTR to make sense of the images, so I'm wondering if there is
anything else out there that is likely to be able to examine the disk
contents?  I'm really looking for PUTR-like functionality to list and copy
files.

Maybe SIMH could be configured to be a DECmate II and be fed the disks?

I have a couple of disk images available in case anyone wants to try them
out - they're purported to be "DECmate II CP/M 2.2 version 2.0" and "System
Disk ver. 2.0 8/24/87":
https://drive.google.com/drive/folders/1PD0TlUPiT7MIPEX6abEn33e7s3kSXp_H?usp=sharing

- David