David, you can do just what you said; cut it out and install at the inlet. In this case, I'm referring to one of the brass inline type from Lowes or Home Depot. Very small screw on type. The black flush is a stand alone system. You can put one at the inlet. They are required to put it at / above the toilet level, which is why you see it where it is. I don't agree that an external has to be the same height as the toilet. As long as the inlet and anti-siphon is above the black tank level, you should be fine. Most inlets are installed a few feet above tank level anyway. On the No Fuss Flush system, it's practically mounted at the same level, so that can be left to another argument. It'll be your decision in the end, and you'll get varying opinions.
As long as we keep buying RV's, I will keep cutting them out. Just one less leak to worry about in a place that can cause a lot of damage.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.