I am sure that Group Initiative API (by "The Aaron") can be configured to manage the d6 initiative that you want. The configuration instructions are a little dense and technical on that, but it's actually just 2 or 3 commands/settings to get it matching your system's initiative rules. If necessary you can ask The Aaron (on this forum) to help set the config, but I think that you will figure it out El Brujo. You start by removing the 5e-ish settings, and make d6 the dice-type, Sort: ascending. For tracking Time in TURNS to Hours (for wandering monsters, searching time, etc), you might also be able to use the Turn Order (feature of roll20), supplement possibly with some API. I think there's one(s) you can use for GP, money, encumbrance, also, but I'm not sure which API's help with that. I can only encourage you that I think it exists or can be done, whether with Macros or API scripts.