If remember,I used the 1964 design of Tromp for Black Sea Command in AAW and ASW variants.With your help the AAW variant is now plausible and the ASW variant digged (too expensive).Tromp was expensive even in 1975 design.
This is the Canadian DDG 1960 Project in its latest version.Looking it,I thought an alternative ship using some parts from the 1964 Tromp and from this.Would this be more economical solution?
Also CN DDG 1960 seem to have space to add hangar for 2 5tn helicopters (e.g AB-212)
My gut instinct is to say "no." Your best, most optimal solution would be to put whatever systems from Tromp into your proverbial shopping cart and design a vessel around that. I've been following what you've been doing and I think you can do it.
My second question is if my LSD Naukratousa can have twin 127mm OTO Melara LW,one in each side.
Sure it can, if the ship is designed to accommodate them.