See what happens when I enter the build too late and offer advice with only a small portion of the story?
My uncle was a machinist, he told me, if a file can cut it, you should be able to drill/ream it. So use a file as a test to see if its hardened if you can. You can work harden the metal if you attempt to cut it too long with a dull bit and it just keeps deforming it.
To anneal steel you can heat it up to the correct temp, and let it cool off slowly, not just air cool, but insulate it cool, like bury it in sand cool.
However, keep in mind, they may weaken the steel if it was originally designed with a certain strength to it, so I don't recommend you do this to critical suspension parts unless you know they were originally just weak mild steel.
Can you get a carbide reamer? That should solve your problem, but I realize after buying two reamers its a little late for that.