Sanicon Tank Budy with Grey Water Bypass

I have been thinking of getting a Sanicon system. I like the portability of the Tank Buddy but unfortunately it does not have a grey water bypass. The Sanicon Twist On has the grey water bypass, but is a permanent install. I think it is an easy mod to buy the grey water bypass parts and modify the Tank Buddy (cheaper too, Tank Buddy is about $100 cheaper than Twist On model and I doubt the parts I need would cost that much) or buy the Twist on and modify the power cord with alligator clips like the Tank Buddy. Just curious if anyone has ever done either of these modifications. Thanks.