Fix/Replace previously patched cast iron toilet drain joint?

[MyoldBungalow]

I just completed replacement of the bathroom subfloor, and was careful to damage the toilet flange, and kept an eye on a previous owner's patch job that is at least 25 years old. As I was putting the floor in place, I noticed a piece of that patch had flaked off.

would a proper repair at this joint be worth while? and does that mean replacing the at the collar with a PVC replacement?

or should I hire someone in to replace the whole stack?

I want to avoid an epoxy repair, but it's on the list.

 

[Terry]

It looks to be lead going into a cast iron hub. I have remove the lead and the brass ferrule and using a rubber donut, built it back out using PVC and ABS.
I don't know what the rest looks like there, but at some point, there will be some replacing being done.

https://terrylove.com/forums/index.php?threads/remove-and-replace-lead-toilet-bend.101519/