I'm not convinced there's enough meat in those hubs - I think you will simply transfer the problem, and possibly make it worse, from the bearing to the sleeve. Nice thin flexi sleeve in an even thinner, even more flexi housing with a nice stiff bearing sat inside it all.Bricol - bearings are SKF 6206-2RS1 - sleeves will be Loctite'd or pinned into housings with 3mm aluminum dowels - I have 5mm which I could remove from these housings before I impact upon the threads, so I am thinking a sleeve with a 3mm wall thickness. "Proper Engineering Companies" charge "proper" prices, (justifiably so) - and if we all went to Proper Engineering Companies I guess there would be no forums like this one.
Matchless - Your comment has worried me the most regarding the amount of use a classic car will actually get.... if I travel 2000 miles per year in it when finished, (assuming I can bend enough to actually get in and out of it...!!! ) I will be surprised - so maybe I am just overthinking this problem....
I'll keep you all posted on what happens.
As you say, it lasted 73000 miles as original . . . glue 'em in with a product engineered to do exactly that so they don't spin to begin with, and change 'em when they start to make a noise.
For the cost of new bearings, you could even change 'em every six months for the next 14 years and still save money compared to new uprights . . .