MK.II/MK.III upgrade to MK.IV

[mixedd]

Hi,
Any chance about MK.II/MK.III base upgrades kits?
I remember when MK.IV launched there were talks about such adapters for older Gunfighter bases.

Case is that Rev.B grips are basically non-existant in stock, so for example me myself are basically left with KG12 grip only without any ability to upgrade.

Maybe it would be wise to also sell reverse grip upgrade kits for us people who are still on properly working MK.II/MK.III Gunfighters?

In short, question is, how can I transform my MK.II from paperweight to something usable, or there are stock coming with SCG Rev.B grips?