In all honesty I do not see any options for the gun other than a replacement of parts. I have been where you are. Long, long ago I 'improved' the trigger pull on a Charter Arms 38 with a similar result. Weirdly, back in those days CA refused to sell me a new hammer or trigger. I had to wait a decade for the firm to go bankrupt and the CA parts I needed to pop up on someone else's website before I could undo what I as a know nothing novice had done.
<LoL to the other issue about steel pins and aluminum frames, that was a learning too.>
With an S&W however the parts issue is more complex. Each variation of 25-# appears to involve more and more changes. There appears to be almost zero parts interchangeability between a 25 and a 625. Cylinders, hammers, triggers, all different. I dislike the target hammer and the target trigger on my 25-5, and once thought a Model 1950 trigger or hammer would simply drop in. Sadly not so. Even a simple thing like a barrel swap from 8 3/8" down to 4", because of a change in how they were made, took a very long time and I had to wait for S&W to dump a bunch of nickeled 4" m25-5 barrels out there before I could even begin to convert my revolver to the configuration I wanted.
What's your best option? The stoning away of metal you did can not be undone. Just keep checking gunparts, jackfirst, gunbroker, etc until the day the exact correct hammer, trigger, etc shows up.