Yes, it should still work with with the latest update. Install instructions above should still work. You shouldn't need to reinstall the mod after an update since the stungun files reside in the patchday8ng and not the update.rpf unless R* moves the weapons.rpf to another location in a future update.
That is something that LSPDFR does I believe. Not currently something you can do for your character. I'm hoping to add that feature in a future release of the X26, granted I can make it work and LSPDFR doesn't enable it first.
Try uninstalling all the mods, skins, and taser then install them one by one until you find the cause of the error. I don't think it is the taser since no one else has reported the issue. To me, it sounds like it is another mod causing it, but I could be wrong.
@WSUCOUGAR The X2 and X3 look to be completely different from the X26, so just a skin wouldn't work. It would involve an entirely different model. I doubt I will ever do a X2 or X3. Sorry.