LIM always stack their figures with accessories, as far back as Venom Snake I cannot see them doing any of those figures except maybe Dutch, and the time required to make and release an entire figure is probably not going to be impacted by adding some of that stuff. Undead Nightmare was a popular game, canon or not, and I would love to see something representative of it, although I think that's very unlikely. I'm not sure what all you could give John aside from a few guns not already covered by Arthur, Red Dead 1 was pretty light on toyetic (accessory-etic?) stuff, and with the Gunslinger he has the winter overcoat, which is why I speculated about some additional costume pieces.
I'm having fun here! I hope you don't think my ideas are threatening the prospects of them making other Van Der Linde members