The Alocasia x calidora (correct name) usually blooms in the Spring and sometimes again in the Fall. That is delayed in your case due to your weather requirements.

Alocasia blooms are pollen receptive when first opened, usually in the morning, and the next day, pollen will drop. If you want to try selfing this plant, you need to collect pollen in a small airtight container and keep it in the refrigerator until your next bloom opens. Once it does, you warm up the pollen, gently cut away an opening in the lower (swollen) spathe area, and apply the pollen with a clean artists brush to the pistil heads.

If you are successful, berries will form and ripen in about two months after pollination. Seeds should be planted immediately upon harvesting from the berries and kept moist. Seeds should never be dried out prior to planting; they should go directly from berry to moist planting medium. I soak mine in distilled water overnight before planting to leach out germination inhibitors.

LariAnn
Aroidia Research

It's blooming again in the greenhouse. I'm keeping temp at a minimum of 50. It's even a bigger bloom than the first time.... What a cool plant!
The first bloom set 5-6 seeds by itself. I planted them and they all came up. I've really had fun with this one.