Believe it or not, I found a pair of new take-off sliders available for less than a pair of adapters. Requires a bit more effort to strip and rebuild the forks, but I planned to do that anyway. In fact I've had a good time lately on US Ebay, with new take-off Brembos as well!
Yes I too found some like new lower legs for under $50, adapters were about $100. I can spend what I saved on some new fork bushings etc.. With the pre Brembo 4 piston calipers, rebuilt fork, and new lower legs , should look good, and stop better.
The bike is on its wheels at present, so I can't quickly and directly compare sizes (the big ends were easy!). Perhaps next week, if nobody else can answer your query.
I'll chime in.. Obviously, I cant guarantee you wont run into issues, but yes, you can turn it down if you'd like.. If your bent on keeping the wheel, I like the bushing idea better.. The left side will be fine.. I had to turn my 1" down for the speedo drive, worked well..