Would you able to bodge up some speedloader carriers for an oddball piece like these Pachmayr hexagonal loaders (not the one pictured, 6 shot N frame hexagonal)? I have a bunch I can send you for moulding purposes.
Are you familiar with The Shmoo, Mr. Fisher?
$85-95 +mount (+shipping&applicable taxes). also varies depending on additional features, colors/patterns ect.
https://www.solelycanadian.com/competition-holsters