I tend to agree with that. After all, the chips are supposed to be 100% pin compatible, so it makes sense that it would work.
Also, if you read the brochure from P&E, now all of a sudden the multilink BDM supports coldfire v1 core, which I suppose means via HCS08 support.
Should I enter a service request to see what they say? I would kinda spoil the party for FSI if you can't use OSBDM with cf version.
Is there any open source flashing software for OSBDM? You (or I) could try flashing the part with that and see if it works.