The samj portable Gimp does have a 32 bit gmic_gimp_qt.
This page https://samjcreations.blogspot.com/ and well down there, the download
http://www.aljacom.com/~gimp/Gimp-2.10.24-setup-3_Portable_32-64bit-Win.7z (360 MB)
It is a monster, unpacks to 1.8 GB and I do not think pulling the gmic plugin out will work with an existing Gimp 2.10 Give it a try, Find in the 32 / Preferences / plug-ins folder.
The portable 32 bit Gimp 2.10.24 does work. Put the 32 bit folder (900 MB) somewhere , The program uses launchers to set the Gimp environment. Looks like this in a 32 bit Win 7 VM. gmic_gimp_qt version 2.9.7
