For what it’s worth I think I figured it out. Thankfully, it had nothing to do with removing the orphans.
Through some searching, I discovered that a custom theme I’d been using was incorrectly ported to Plasma 6 that was searching for outdated libraries, prior to those that I listed above were moved to libplasma.
From what I figured out, I made a stupid copy/pasta and created some issues with my Breeze sddm directory. After forcing a reinstall of that, it’s all fine. In the meantime, I found a custom sddm theme that was correctly ported.