I think this thread degraded a little. I think that there is an open question about how bad this paint it that means it can’t be clayed. Like most, I have lots of wax experience and a handful of claying experiences. My thought is that ceramic is much less forgiving than wax, and that ceramic amplifies imperfections. Ceramic lasts a lot longer, so these errors are with you. Wax is warmer, more forgiving, and makes the best of what you have. Both offer protection, but ceramic is hard as nails and therefore provides better protection.
I think that the OP would do well to consider wax. One other poster showed a picture of Meguiar’s Ceramic Wax liquid. I have used it on well worn black paint and it has held up great. (I did wash, decon, clay, compound, polish as though I was putting on real ceramic.
As far as ceramic products go, have used Nano Bond, which is easy to apply and with very good results. It is under $40 and would be a great choice. Also have used Ethos Max. Excellent results, far more expensive, and quite a bit more tricky to apply.
I did use Nano Bond on some very worn out, no clear, patina and fade paint one time. It did provide shine and protection. Best wishes.