It is my understanding that Fobus offers one of their holsters(plastic) for the K frame-4" in paddle configuration.
Lippman Enterprises is one distributor
www.lippman-enterprises.com
You can email them for conformation
lippy@francomm.com
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You have specified the parkerized finish---I cannot help you there but I do suggest you consider the Black-T finish which is offered by Mr. Walter Birdsong---601-939-7448
He has the current contract to finish 5000 of FBI handguns and he finished one of my revolvers last summer.
He has perfected a process which removes all the existing finish-regardless of the type. That is of vital importance because the actual finish will adhere and remain on the gun sence it has a clean foundation to cling to.
It is offered in matte black or green.
It is ugly as homemade sin but utterly practical.
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I suggest you aquire one or more of the professional grade 'Belt Badge' clip ons and have a leather-smith sew or brad a exsiting belt looped speedloader case on it. That is the current LEO practice here and it makes for a heavy service item.
Don Mallard