Ability to mass-delete faces in Face Detection on Lightroom

I've just started to venture into Face Detection within Lightroom Classic.

Having watched the initial video on how to do it I needed some details and the technician on the chat confirmed that I wasn't missing a trick - simply Lightroom doesn't do some things I need. This is post two of two to raise these issues.

I'm a wedding photographer. I have all my weddings in one catalog along with sporting events I've done, seminars, and my family photos. There's over 128,000 images

This week-end I've been investigating Face Detection. Do you realise how long it takes to detect faces on that many images when there's lots of "crowd" in the background? Four days on and my brand-new-this-year-highly-specced-PC is still on its knees doing the job.

Now the problem isn't letting the faces get detected it is deleting the stuff one doesn't want.

I asked about turning on Face Detection and turned it on for the catalog but that means that every image needs to get checked. The result is that 128,000 images are scanned.

I only wanted to detect faces in reality for my family photos. I don't want to be detecting brides and grooms to tag them. All I care about is finding my favourite photos of my family.

On one drive I've got 22,114 images and 324 named people as a result.
On the other drive I've got 106,590 images and 3144 named people.

You can imagine how many "Unnamed People" are in each of those drives. Tens of thousands and rising as the scan continues.

I completed tagging people in my family by selecting the folders with the family photos in - but the rest are simply "in the catalog" and as it is a toggle for the catalog that's what I have to do.

Having 35,000 images (for example) and trying to select them all to hit backspace and remove them from the unnamed list just brings Lightroom to "not repsonding" mode.

Leaving them there and having them present in the unnamed list is not helpful either - because as I add new family photos I can't quickly tag individuals.

As I do a new wedding dozens of new "unnamed people" will get added.

All of which brings me to two thoughts.
1) allow scanning only of particular folders and not the whole catalogue - to avoid having to scan images that one doesn't want to identify at all being scanned.
2) have a button or menu item to "remove all other Unnamed People from the current list" because you've no idea how long this is going to take me to remove all these Unnamed People now and tidy my catalog up again!