As always I recommend just cleaning and tuning then riding a while to be sure you like it, then start changing it to suit your needs or desire.
A 7spd FW and barends would be probably be the quickest and cheapest route.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk