I've been told all you need to rectify probs using Metro hubs, is a pair of 1.5* neg camber bottom arms. If so, shouldn't cost much at all. Maybe $200 tops. If correct I'd do that and keep the 4 pots.
There is another option- get 2 Cooper or Cooper S swivel hubs and hang your brakes & CVs off them. Geometry will then be correct.
re. the Hondas & Camiras- fitting these discs to the stock drum swivel hubs does not affect the alignment, as the swivel hubs and steering arms etc stay stock.
Indeed the Hondas can be fitted without even taking the swivel hubs off the car!
Track width -flange to flange with both setups (with 25mm `spacer' on the Hondas) is as per a Cooper S.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.