Ment
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And right away, the worst possible suggestion from Ment. It’s better to be, damn it, I don’t know, a blind artist than a mercenary with a moral code.
Because if there are no rules at all, do whatever you want, it will look like some kind of gang (even if it isn't actually), and more or less "normal" characters are unlikely to want to get involved, they'll think it's suspicious.
Of course, you need to remember that the rules should only be minimally necessary for the interaction of our group. So that all sorts of scoundrels can also join, yes, seeking their own benefit, although they could not do absolutely anything.
This also applies to the Order, actually.
In this regard, I liked Ples's code, as it provided guidance for interaction between comrades, but did not restrict them in almost anything in terms of methods of completing the task.
And, one more point, rules look professional and can help in forming a good reputation for the order/mercenaries.
In terms of examples, Lock said well about Halmedir. Well, obviously, such behavior should be considered quite acceptable.
But it is better not just to consider such people as Keiji unacceptable, but to somehow try to get rid of such comrades from the group in advance (oh, a vampire who can read minds would be useful here!). In any case, in my opinion, it will be better to resolve such situations like Keiji not with concepts (oh, what a scoundrel, he robbed his own, I'll drag him out from under the ground), but to have written rules on this matter and people's loyalty to this code. It may seem insignificant, but in essence, this is what can give a group of Araidians the appearance of professional mercenaries (among other factors, of course). And this will improve the ability to come up with a motivation for almost any character.
Well, in general, I would also like to wait for Alex and see what he comes up with.