First of all: THANK YOU ALL.
Sincerely, this is why this forum exists over the years.
Back to business: I'm getting from you both that I can avoid the re-wiring by making the MasterLink cables be a neutral media to transfer a standard PowerLink signal as I plug at both extensions a PowerLink DIN plug with exact same wiring. This way, it just behave as a PowerLink cable with lot of wires unused.
Clever idea, indeed. To make around the missing females, an alternative may be for me to use the MasterLink cable but remove the males and attach a PowerLink DIN directly; I mess up the cable and is no more a MasterLink, but I'd not care. Anyhow, as soldering is required I may as well do the rewiring with PowerLink cable. WIl just take more time and some work, but the ultimate result appears cleaner (as Steve suggested above already).
