I made such a change. Don't recall how many teeth on the original chain ring, but we went to 24t first, and couldn't keep the chain on while downshifting. Went up to 26t, and a wide ratio cassette. It worked fine. There is a really big jump from middle to small chain ring, though. My perception is that shifting the FD one time is now like dropping two cogs on the cassette. It used to be two. Still, if you have some really steep hills, it's a solution.
The only problem has been that if you are in the small chain ring, you need to be in towards the largest cog in the rear. If you use the smallest cog, the jockey wheel is so far rearward that the the chain sort of doubles upon itself, and the chain is actually rubbing against another part of the chain. I can't say if this is common to all such modifications, or only mine.
Some people are like a Slinky ... not really good for anything, but you still can't help but smile when you shove them down the stairs.