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Perhaps an arrangement for pre Tri Nations could be:
Argentina plays each 3N once
Each 3N plays one of Samoa/Fiji/Tonga
Each 3N plays one NH once
So for example, during the Australia Bundy Series we may see:
Round 1- Australia v Samoa, Australia "A" v Wales, New Zealand v Argentina, South Africa v England
Round 2- Australia v Wales, Australia "A" v Samoa, New Zealand v Fiji, South Africa v Argentina
Round 3- Australia v Argentina, Australia "A" v Fiji, New Zealand v Ireland, South Africa v Tonga
NZ and SA would also be having "A" fixtures against the PI's and visiting NH team.
And each "A" fixture would be a curtain raiser to the respective home nations' Test Match that weekend.
What do you reckon about that?