  We consider the reduced quasi-classical self-dual Yang-Mills equation (rYME)
and two recently found (Jahnov\'{a} and Voj\v{c}\'{a}k, 2024) invertible
recursion operators $\mathcal{R}^q$ and $\mathcal{R}^m$ for its full-fledged
(in a given differential covering) nonlocal symmetries. We introduce a
$\mathbb{Z}$-grading on the Lie algebra $\mathrm{sym}_{\mathcal{L}}^{\tau^W}
(\mathcal E)$ of all nonlocal Laurent polynomial symmetries of the rYME and
prove that both the operators $\mathcal{R}^q$ and $\mathcal{R}^m$ are
$\mathbb{Z}$-graded automorphisms of the underlying vector space on the set
$\mathrm{sym}_{\mathcal{L}}^{\tau^W} (\mathcal E)$. This inter alia implies
that all its vector subspaces formed by all homogeneous elements of a given
fixed degree (i.e. a weight in the context below) are mutually isomorphic, and
thus each of them can be uniquely reconstructed from the vector space of all
homogeneous symmetries of the zero degree. To the best of our knowledge, such a
result is unparalleled in the current body of literature. The obtained results
are used for the construction of a Lie subalgebra $V$ of
$\mathrm{sym}_{\mathcal{L}}^{\tau^W} (\mathcal E)$ which contains all known to
us nonlocal Laurent polynomial symmetries of the rYME. The Lie algebra $V$ is
subsequently described as the linear span of the orbits of a set of selected
zero-weight symmetries - we refer to them as to the seed generators of $V$.
Further, we study the hierarchies of symmetries related to the seed generators
under the action of the group of recursion operators generated by
$\mathcal{R}^q$ and $\mathcal{R}^m$. Finally, the linear
dependence/independence of the (sub)set of generators of $V$ is discussed.
