This may be hosted on the classiccmp server if you wish. There are already plans afoot for a registry there that would include both public and private listings, as well as measures to ensure entries that are desired to be anonymous (but verified) can be presented as well. The initial idea was for HP21xx/1000 boxes, but the plan is to extend it to other machines as well.
It looks like planning for an 11/7XX registry are already well along, but just wanted to state the offer. Best, J