$2$-rotundity of some nonseparable abstract interpolation spaces

Generalizing a construction due to Argyros and Motakis \cite{AM}, we define a nonseparable abstract interpolation space associated to any given reflexive space with an unconditional basis together with the Schreier spaces associated to an increasing sequence of compact families of finite subsets of an uncountable set.

Under a mild complexity assumption on the families, we prove that the interpolation space admits a $2$-rotund norm with an uncountable $1$-unconditional basis.