Iwahori-Hecke model for the universal supersingular representation

Let $F$ be a non-archimedean local field with residue field $\mathbb{F}_q$. When $F$ is a finite extension of $\mathbb{Q}_{p}$, Anandavardhanan-Borisagar and Anandavardhanan-Jana introduced an Iwahori-Hecke model for the universal supersingular representation $\pi_r$ in the regular case $0 < r < q-1$. When $F=\mathbb{Q}_{p}$, the first author introduced an Iwahori-Hecke model for $\pi_r$ when $r = 0, p - 1$. We extend this result to an arbitrary local field $F$ for $r = 0, q - 1$. We also write down an explicit non-split self-extension of $\pi_r$ which has a four-dimensional space of $I(1)$-invariants when $F = \mathbb{Q}_p$ and $r = 0, p-1$.