Your answer would indeed be very appreciative.
The answer to your question is no. The issue is the acid in the juice. Your wine would have double the acidity making is very sharp tasting. I strongly suggest that you only use one wine making kit per 6 gallons. You will be very surprised at the amount of body and flavor your wine will have when using these wine making kits in this way.
Thank you for your question,
Ed Kraus is a 3rd generation home brewer/winemaker and has been an owner of E. C. Kraus since 1999. He has been helping individuals make better wine and beer for over 25 years.