In a pinch, you can usually use other, larger-caliber sizing and seating dies to load AI cartridges.
For the .30-30 AI, for instance, you can NOT use the regular .30-30 sizing or seating dies because the AI shoulder diameter is larger.
But, you can use the .300 Savage, .308 Winchester, or similar-lenth (or shorter) sizing die to neck-size the fired .30-30 AI case. Similarly, you use the .300 Savage or .308 Winchester seating die to seat bullets in the .30-30 AI.
Yes, wildcat reloading dies are expensive, but short of finding good used ones, all you can do is modify standard dies (re-ream) or adapt existing dies.