Single speed to geared conversion

Scotty T

Walks the walk
I am pretty sick of spinning at dog knows what ridiculous cadence on my tiny cranks on my single speed e-cruiser, it has provision for a cassette so I'm planning to convert to use the old 8sp shifter I have on the Mongoose and upgrade its shifters (left one is damaged but only need right for e-bike) and the rest is in the parts bin. My question is what have people used on a sliding dropout bike that is not proprietary to convert? The DMR ones look like the biz as I would probably need to lose my current chain tensioner to get a derailluer in there. Second question is does anyone have some of these or simlar conversion bits?

 
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