first of all, i wouldnt reccomend making a curved wall. it is harder to do things like small layers and mechanisms. As far as im concerned, its nearly impossable to make a wall invulnerable to those elements. A possible solution is to make pressure or gravity to push those away however, dest is anti- air so it is attracted by high pressure. in other words, this is going to be very hard.

What would "NON-OP" means include?

every element has some unique weakness

It is possible but takes an insane amount of effort and research. Consider using regenerating walls (CRAY or SHLD). Also, think about making a BRAY force field. A GPMP field would be great against DEST and AMTR. However, don't, and I mean it, use GPMP on SING. It is a recipe for disaster as it will spread the SING everywhere. Maybe, make a DETC system that when it detects DEST, SING or AMTR, it sends out a field of TRON or ANAR. MORT would be useful for blocking the DEST attacks. Although MORT causes a bit of lag, it is useful in bunkers as a last hope kind of thing. The MORT will fly around everywhere and they will make SMKE. The SKME will be destroyed but the bunker will be safe.