Ferocactus Chrysacanthus Rubrispinus as a Grafting Stock?

[Bambarbia]

Hi,

My local store has dozens of Ferocactus Chrysacanthus Rubrispinus ($4 each - is it cheap? 5cm-7cm diameter)

Is it possible to graft on it? I want to graft some Ariocarpus seedlings, and variagata

I found on Internet only references to Ferocactus Glaucescens which looks on pictures very similar to F. Chrysacanthus

Thanks,

[Constanz]

These can be used to spread the knowledge, because I see it as a good content.