peebee has graciously published various Qt5 packages, https://sourceforge.net/projects/lxpup/ ... Qt5/Older/. Thanks, peebee.
He notes: "Note: these LXQt addons are compatible with version 20.06+0 or later of LxPupSc32, LxPupSc64, ScPup32 and ScPup64 plus BionicPup64-8.0, UPupFF+D-20.08 and FossaPup64-9.x"
If you are aware of any other published versions, please post to this thread.