Givi mounting plate for OEM Hondaline top case?

I've got an 06 VFR with the Givi V35 side cases and PLX mounting bracket already. I'm looking to buy a Honda OEM top case (also made by Givi) from another VFR owner, but can't find any info online for the life of me if the stock Givi M5 or M6 monokey mounting plates will work with it.

I don't want to get the Honda OEM bracket because from what I've read, it's (a) expensive, (b) heavy, and (c) won't fit with my current Givi side case mounts.

Do you guys happen to know if there's a Givi mounting plate out there that will work with the Honda OEM top case? Or are they completely different beasts and I'll have to fabricate one that fits?

Thanks!