The official answer would be no. You cannot bring someone as a guest unless you are present and using the same credentials for your own entrance. In effect you would be loaning your Lounge Club membership to your guests, which is not permitted.
The practical answer will depend on the lounge attendant, who may not know or care about the nuances of Lounge Club's rules. Just present both cards and ask if you can use one for yourself and one for your guest. Don't waste time with an explanation, the attendant knows nothing about your individual memberships.