Look around for used ones. They're usually pretty robust. I've seen 100x more EGR setups thrown in the trash because "muh useless emissions" than replaced because they didn't work.
The B14 GA16DE EGR valve is very similar to a KA24DE EGR valve once you swap the KA's little right angle manifold adapter thing onto it. The port for the hardline that goes to the bottom of the BPT valve points the other way but there should be enough room to reroute the line. If you had a KA24DE and GA16DE EGR valve next to each other you'd see what I mean. I think you can use a GA16DE BPT valve also, except for the bracket. The D21 and D22 KA EGR is also pretty similar. No other Nissans I can find have the same angle for the crossover pipe.
I think you can still get the S14 crossover pipe new, but if not, look up how people have made their own replacement crossover pipes out of stainless steel flex gas line. Would work very similar to this for the KA:
https://www.miatafied.com/projects/p...-tube-reroute/