We purchased this old farmhouse sink for a renovation (I already regret this...), and I'm trying to fit a drain but the hole is about 1-3/16". The pic is an extra drain assembly I have where the 1-1/4" part of the tailpiece ALMOST fits.

So far, the plan I came up with is to use a step drill bit to widen the hole a little and then use a bar sink drain that is 1-1/4 outside diameter.

Then I would either fill the screw holes with epoxy and use a removable 4-1/2" diameter strainer, or install a screw in plate style strainer with some rubber gaskets.

I also had a plumber come for another project who suggested we should cut off the horn at the bottom to allow the installation of a 4-1/2" kitchen sink drain. Hesitant to do this though...

Pics of proposed solutions are included, thanks in advance for any help or just to say if I'm on the right track!

https://imgur.com/a/wZQxhu8#nZEylc7