  We present an alternative finite-size approach to a set of parity conserving
interfaces involving attachment, dissociation, and detachment of extended
objects in 1+1 dimensions. With the aid of a nonlocal construct introduced by
Barma and Dhar in related systems [Phys. Rev. Lett. 73, 2135 (1994)], we
circumvent the subdiffusive dynamics and examine close-to-equilibrium aspects
of these interfaces by assembling states of much smaller, numerically
accessible scales. As a result, roughening exponents, height correlations, and
width distributions exhibiting universal scaling functions are evaluated for
interfaces virtually grown out of dimers and trimers on large-scale substrates.
Dynamic exponents are also studied by finite-size scaling of the spectrum gaps
of evolution operators.
