Been wanting to do this since getting my Blade, as the majority of the Bikes I've owned, and all those I've raced, have had the 'correct' 1-UP~5-Down pattern.
Was looking into remaking the whole Linkage arrangement, as I thought the simple option of putting a Lever directly onto the Gear-Change Shaft wasn't an option, I was wrong.
Took a chance on a used VFR750 (RC24) Lever, it fits like it was made for the job!




Would probably be too long without the Rear-Sets, but it's perfect with them.
Just touches the Plastic Sprocket Cover on the up-swing, but not enough to worry about.
I'll probably modify the Cover to clear it at some point.

 

Put a few miles on it today, feels great to have the Gear-Change sorted at last!

 

Glad it worked out for you.

 

And now it's back to normal . . .

Decided I have to sell it, unfortunately.

I really like it, having a great time every time I ride it, but it's 'too much' Bike for the use I'm putting it to, which is mostly short local journeys, and going to/from work.
I'm looking at the KTM Duke II now, should get a good one for what I expect to get for the Blade . . .