I'm assuming that you want to go no faster than 7000rpm for a small wheel so if you had a 2880 rpm motor- which you haven't, you would use the 2 to 1 pulleys( per drawings and my earlier post) to give something like a safe 4000 revs. However, you want roughly double the motor pulley diameter for the dreaded 1440 one. however, I assume that if you want a bigger wheel the present pulleys would be OK.
If you think about it, a cheap but not too nasty 6" Double ended grinder ( full of Eastern promise) will drive a 6" wheel at each end at 2880 rpm.
So, if you recall my earlier reservations, I would have gone out and got one- until something better materialised.

If you had one, you could rough grind at one end-- and drive the Kennet from the other. :

I might not be the World's best computer freak( said he waving his wooden leg aloft) but I 've done this tool and cutter malarkey before

Goes back to his wheelchair and incontinence pads

Norm