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I have not looked into or used rehlds before but perhaps its using different natives for player models.

Fakemeta should work for both rehlds and normal hlds

With the player models 1.3.1 plugin :
Is the name of the model in the folder the same as the folder name. They both have to be the same Example :
terror_new/terror_new.mdl
leet_new/leet_new.mdl
gign_new/gign_new.mdl

Alternatively if no plugin works (orpheu wont work either because the binary differs) you can try this

Download HxD Hex Editor . open the mp.dll with HxD

From the Menu goto search and type in the names of the model.

Replace the name of the model with a name that is either smaller than or the exact same length as the original model name:

so leet/leet.mdl has to be something like let1/let1.mdl or urban/urban.mdl has to be something like urbn1/urbn1.mdl

leet cannot be leet1/leet1.mdl or leet_new/leet_new.mdl if you use this method.

Save - Reupload mp.dll - Restart server.

Make sure you STOP server before re-uploading the edited mp.dll

.