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Try to blend out the step where your uncle finished machining using either a die grinder/dremel or riffler files.
I fitted the YZ85 reeds into a TY250 after reading about which block to buy on the old forum - RDs & TYs have the same reed block going off part numbers.
I was able to use my dremel with ballnose endmill to remove metal quickly which takes a steady hand, I had marked how far into the cylinder the reed needed to sit before I started & knew how much needed to come out at the deepest point & kept trying the reed block in the hole until it fitted nicely. After that I just tapered the port wall out until it met the liner & knocked the lumps off the casting but didn't touch anything with sandpaper
Takes a bit of time but is better than wrecking a cylinder by breaking out the side of the port

This is how the sidewall looked when I'd finished

That's a nice looking bike - and the blasting result makes me want to get mine done - just need to find someone who does that in Brisbane.

Very slick.

Look on the OZVMX forum & you'll find some recommendations for vapour blasting in the Brisbane area. Getting to be go to finish on dirt bikes as well because as well as looking like new it seems to be very stain resistant unlike bead blasting