Back in 2010 there was a guy in Kentucky servicing the SaniCons. He had all the parts for them and had a nice website. But, as this was not his full time job and sales slowed down, he quit the SaniCon business.
I had purchased some parts from him and asked if he had an adapter to convert my SaniCon to a portable unit. He said no. Next day he called back to tell me he made me one by slowly heating a bayonet adapter to fit over the 3" hose end of the SaniCon.
Maybe you could do the same thing if you are handy.