Make the Hell gate interactable object similar to the undercity pylon.
- Turn the IH compasses into keys similar to the undercity tributes.
- Use the IH tributes on the gate to open.
- You can even add modifiers similar to undercity but with gem fragments (e.g. 5000 ruby fragments to not have spires).
This solution solves the inventory problems, introduces a gem fragment sink and allows players to customize their run.