There is nothing special about an A+ box that makes it require a Verto clutch.
IMO non Verto clutches are better because:
1. The whole flywheel assembly can be lighter.
2. You can choose from blue , orange, grey, or double grey dot diaphragms.
3. They are way cheaper, the price of new Verto stuff is ridiculous.
4. Verto stuff is rare in Australia (Rovers & Metros never sold here).
The only benefit of a Verto clutch in a Mini IMO is less pedal pressure, as it has a `conventional' automotive style pressure plate with fingers in it..
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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.
