I don’t think this is something we would be willing to provide - or even allow to be possible.
An ARPG is fundamentally an item hunt, and the rarity of some equipment is one of the reasons people keeping playing; acquiring specific items one of the goals they continue to have. It really isn’t healthy for such games to facilitate people having access - even temporary access - to the most seldom encountered of items without investment. Even for those that never use such a feature, simply knowing it is there - that they can have any item, at any time - will change how they see the game & make the most rare of items feel a bit less special and a bit more obtainable. There are also other side-effects, such as the race to ‘solving’ aspects of the game (e.g. establishing which gear is Best in Slot, which class passives are optimal) being shorter-lived.
We’ve been having conversations internally about preventing offline characters being used for this purpose when the game leaves Early Access. While we don’t yet have anything to announce, it is something we perceive as a problem & it is absolutely on our radar.
Edit: I don’t know if you’ve looked at any yet, but build guides on YouTube might help, @Shtrak.