Thanks to all the members in my previous question regarding nuclear armed missiles (nukes). From those responses, it turns out nukes are more powerful than I expected they would be in terms of spaceborne combat.
So for the purposes of my worldbuilding (WB) exercise, I am left with a conundrum on how to deal with them.
First some basic relevant background. This is the WB as I've envisaged, but I certainly welcome additional ideas.
Setting is millenia in the future;
There are no what I see as purely handwavium weapons - no disruptors, no transphasic torpedoes, no turbolasers, no hyper-relativistic kill vehicles (ie kinetic energy (KE) weapons with high partial c velocities);
Weapons in use are lasers, coil/railguns, missiles, particle cannons, drones. Although, in my setting, large capital warships are virtually immune to lasers (handwavium (HW) tech), although they are still used as point defences (PD) and to disable/destroy vessels w/o the HW tech;
The problem for me is nukes. Warships in my WB are large (hundreds of meters long) and heavily armored (tens of cm of armor). I further envisage that initial salvos will be volleys of missiles. The problem is, as pointed out to me, a single nuke, detonated close to a vessel, can virtually vaporise it, if not simply shred it. That then means that it is pointless to have large, heavily armored warships if they can be so easily destroyed. Which is not what I want. I want more protracted "slugfests"
So, how to deal with nukes? My solutions so far:
Ban them by Galactic Treaty. Such treaties exist in my WB (mass drivers (other than coil/railguns) for example). However, given how effective they are, it doesn't seem like parties would so easily give them up.
Make PD extremely effective, but then, why have missiles at all?
Special "anti-heat" armor, which is what I'm kinda leaning towards, but I was hoping for something more creative. This option keeps nukes in play, while option 4 below pretty much removes nukes from the table altogether. Note, there are no "Star Trek" shields in my WB. There is also no artificial gravity (via graviton generators et al), so missiles can't be deflected using "graviton beams".
My most "creative" solution is what I call "radiating countermeasures". Essentially, they would fry all electronic equipment on a missile/drone at a range of 5-10 km out, thus, a nuke could never detonate close to a warship (at least while the countermeasures are working). In this case, missiles would instead have multiple KE warheads that are ejected from the missile just outside the countermeasure range, which would be terminally unguided, but otherwise unaffected by the countermeasures.
So my question, how do I deal with nukes in the context of my WB exercise? Input is desired. Hopefully I've given enough detail without too many boring WB details. Thanks.