I have said several times before over the years to be careful if buying LR studs to replace ALKO ones as the ALKO large ones have a larger Knurled/spline diameter than the LR ones, so you have to redrill anyway.
It is best to get blank hubs and have them drilled to the LR stud size.
2 If fitting LR mags you have to use LR studs as there are no nuts available in Imperial.
3 NA here but D2/D3 wheels are VERY difficult to fit to ALKO parallel drums. I needed to use adaptors from UK.
There is a thread from about 3or 4 years ago.
Regards Philip A