Google got rid of click2call, when used with a Google Voice number on an OBi, because it required using its Chat service, which Google discontinued offering a couple years ago (replaced by Google Hangouts). The only use for chat now is for OBi devices.
Yes, that supposed workaround is not worth the nerd-hassle. If this is a BFD for you, then simply get an inbound DID (SIP VoIP phone number) and use that as a target instead of Chat.