There is going to be no small PHEVs because it is cheaper to build small BEVs. Case example in Finland:

Cheapest new BEVs start at 25.000€ (Citroen e-c3, Nissan Leaf)

Cheapest PHEV Start at 33.000€ (Kia CEED, Renault captur)

People think PHEV makes things cheaper than BEV. But really mixing two powertrains is expensive and complex, and can only be fit in big cars. Plug-in hybrid is a luxury feature that allows you not worry about charging on the road.