I have two cats, and three litter boxes. One of those boxes is behind a small slipper chair in my living room area. Since it's quite handy, it's easy to keep clean, too. I just watch when Dottie 'goes', and remove what needs to be removed.
Hey, carrying someone/something you want to make sure does what they do in the right spot....we did it when toilet training our kids, so what the hey? If it works, do it. I also had a time when I had multiple cats..and one cat used to bully Dottie.

So I got in the habit of watching Dottie, and when she stood up and gave me, "The Look", I grabbed her, hauled her to the pan in the bathroom, and she was "Home Free". Getting back from the litter box was a bit of a challaenge, because PeekaBoo used to follow me and lie in wait for the older cat.
I'd stand guard for Dottie until she was done, and then she would take her own chances getting back to the living room. She didn't mind the return trip under her own power, because she didn't have a full bladder to deal with when making the run. Frequently Peekaboo would get trounced for her attempts to bully. Whatever works.
BTW who among us ol ladies doesn't have trouble carrying out a task, when they've got a full bladder? I've only really appreciated that since coming of age, into my senior years. When I gotta go, please, no distractions!

GET OUTTA MY WAY!
Addendum: There's a new litter box in town called Litter Breeze..and it uses a 'puppy pad' to catch the urine. No smell. The litter itself is non absorbable, and lasts a long, long time. You just scoop the solids. I'm going to get one for the living room as soon as I can spring for the loot.