I'd guess that by altering the geometry on the front end (ride height), this problem can never be sorted properly - unless the Cupra TCAs are as suggested, just a bit shorter so that the bottom of the strut/hub gets pulled in. As suggested by someone already, getting adjustable top mounts is the way to go - but £££££. I'd say that its pretty cruel for "go faster" outlets mugging folk into buying kits that lower the suspension without correction bits for camber. These places know exactly who they are (mainly) selling to.
On a slightly different note, when I got a good VAG indie to fit Cupra TCA rear bushes to my wife's bog standard 1.4 Polo 9N, I was very pleased with the results - until about 8,500 miles later when both front tyres were s**gged by MOT time - these Michelin Pilot Exaltos were 30 miles old when the Cupra bushes were fitted - but that was more a caster problem (error) than a camber error - though the camber was not spot on. So, for 12 months or 8,500 miles car needed two new tyres and another four wheel re-alignment which came out to about £85 + £85 + £80 = £250 !!