I would just feel safer with a more substantial toe rail.
I was going to ask "Why?" but then realized you'd said this.
I still ask "Why?"
The C27s and almost all that generation of Catalinas have a pretty good sized toe rail at the gunwale.
One of the things I've found to be an extremely important SAFETY item is to get good shoes with great GRIPPING power. Just yesterday I forgot to change into my "only-on-the-boat" shoes and damn near slid across the cockpit and we hadn't even left the dock!
Do you have roller furling? If not, then I suggest you invest in a downhaul line, as shown below (for a C22 but it is as applicable to your boat as to that one and even larger boats).
When we had our C22 & C25, we'd sail on port tack, then heave to, and then drop the jib with the downhaul line (halyard led aft) from the cockpit. Much safer than going out on a bouncy foredeck.
Even if you find the extrusions, mounting them securely will be a real bear because of how Catalina built the hull to deck joint underneath the gunwale.
Good luck.