I realized now, my question is not necessary for this game. I can just roll the dice and present them as observation, ask for 0-13 possible actions to do with them, having deterministic consequences AND as 15th action, if there is “pass” or “go on” afterwards.
Nevertheless, there definitely are games out there which have different, (repeating) phases with stochastic elements between them like dice, or interaction of other players, so the actions for different phases cannot simply be put together in one vector like that. So the question remains to be answered, even though I can continue my project now.