Yeppers, it was a bunch of twists and turns and flips and sticking fingers over holes blah blah blah. There are many YouTube vids if anyone wants to try the upside down fill method.
I didn't care for it, nor did I really love using the KFill tool, so I madly converted all my KFs to bell cap tanks, and in so doing, made them all top fill. It took some time and patience to find everything I wanted, but it's now done!
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They may be around on other sites, but as for FT, the only one left has the integrated top nut/drip tip. ME NO LIKEY, so I replaced it with a difference chimney set up, a removable top nut, and my own drip tip. MUCH better.
I even agonized over finding a BLACK top nut for my setups, and FINALLY, SCORE!!!!!!
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https://www.fasttech.com/products/9450800