There are cases where a pseudonym is used essentially as a brand for a set of works, and other cases where the a pseudonym is adopted after a certain point in a career.
J.I.M. Stewart, and academic writer, used "Michael Innes" to brand his mystery novels. Even if the Innes books were reissued as by Stewart, the Innes name would still have value as an identifier for those works as a coherent body of work.
In contrast, Frederick Manfred initially started writing under his real name Feike Feikema, and then adopted the pesudonym Manfred for all his works thereafter. This is less like a branding and more like a name change (or possibly a brand change). Republications
of the early works originally published under Feikema have appeared under Manfred--or rather, all but one have reappeared. So far as I can determine, "Boy Almighty" has not been republished since its first appearance under the Feikema name.
The question is, should main entry practice for "Boy Almighty" follow the practice for authors with pseudonyms or the practice for authors with name changes? It fits both categories.