I just left my geared wheel as it is, took the 8-speed cassette off, slid a couple of gusset spacers on with the cog, shortened the chain, screwed the tensioner on, and viola, jobs done.
You might need to swap the front chain-ring over to the middle to get your chain-line right.
My chain-line is a bit off but with some luck some spacers should sort it out
I just left my geared wheel as it is, took the 8-speed cassette off, slid a couple of gusset spacers on with the cog, shortened the chain, screwed the tensioner on, and viola, jobs done.
You might need to swap the front chain-ring over to the middle to get your chain-line right.
My chain-line is a bit off but with some luck some spacers should sort it out
here's mine