Hi
Cheers for the links - not seen those before (prob because I don't use minikegs).
Just search Ebay for 'disposable regulator' - you'll find nil, 1 and 2 gauge versions. The 2 gauge versions show flow rate, not psi, on the outlet gauge, so no good for setting pressure in the keg.
Can't see details in the pics, so can't tell if the 5/8 bsp gas connection in the LHB description is male or female, and can't read the German description! Best suggest is to give LHB a bell.
The tap won't connect to the disposable reg 'as is'. The regs come with a 4mm push-fit outlet for plastic tube. The outlet is female threaded - 1/4 bsp IIRC - so could be removed/replaced.
If you're after a small cylinder system to fit in the fridge, an alternative is a sodastream cylinder adaptor from CO2 Art with a standard regulator.
Cheers,
Chris