There are many A50 / A65's on the road today, and many built as we type / read this

Surely, there are more than 1 way to do the job, or at least how I look at it

I saw the comment about an expanding reamer

With a 6 flute adjustable reamer, I do not see any issue, just making sure its rigid and inline

Reamers can be tricky, take small cuts and measure as you go