The issue of currency consumption can be addressed through item crafting.

We could add a crafting system similar to Torchlight: Infinite, where players use a Divine Orb to lock a specific affix on an item, then spend a certain amount of Chaos Orbs and other corresponding currencies to reroll only that affix.
Both the affix type and tier are randomized each time. It all comes down to luck to roll a high-value T1 affix.
This system would heavily consume Divine Orbs, Chaos Orbs, and other crafting currencies.

Greatly reduce the difficulty of obtaining high‑tier affixes.
Item Level 80 should be set for T3 affixes, Item Level 84 for T2, and Item Level 86 for T1.
Alternatively, place a cap on the number of T1 and T2 affixes that can appear on low‑item‑level items.
Also drastically reduce the drop rate of high‑item‑level gear by more than 95%.