We abolished biological and chemical weapons because they are considered obsolete tools of war after nuclear was invented. Who enforces the abolishment of bio/chem? States with nuclear arsenals. There’s little appetite in nuclear powered nations for nuclear disarmament. There is appetite for nuclear nonproliferation among nuclear powers, in large part because it maintains the power imbalance.

If you want to push for nuclear disarmament you’ll have to find a different model than bio/chem disarmament.