Thank you all for the responses.
To clarify, I have already converted most of my 7 or 8 old 1122 switches to fixed voltage input, and four of the rehab switches are in my trial layout pictured above. I made some mention of my experience with the modified switches in my original post, including a trial of capacitor discharge power.
I guess what I have already learned is that these switches need more consideration about power supply, especially if you have multiple switches in a smaller track plan. I was interested to know of other people's experiences with them. I gather that they are not real popular in modern times, but I happened to get some for free so I am trying to make the best use of them.
I may just use multiple capacitor discharge supplies for these switches. But here is one of the quirks: Suppose you have a train going through a small reverse loop with an 1122 switch powered by capacitor discharge. The switch triggers automatically and unnecessarily when the train enters the loop, and if the train goes through the loop too fast the capacitor may not be adequately charged to fire the switch again for the train to exit the loop. Same problem with different switches in close proximity, unless each has its own capacitor discharge supply.
I have an existing O-gauge layout with some O22 switches and their non-derailing feature works great, especially with fixed voltage input.
