• You said your rear looks like the 2nd one which is a track hub (2 sets of threads).
    If it has only 1 set of threads then you can't use a lockring and therefore can only ride a bodged fixed.
    I don't like recommending suicide hub setups so I'm not going to.
    Just get yourself a freewheel, two brakes and ride ss until you can buy/build a proper fixed rear wheel.

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