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vilms5000
It was, it suffers a bit being locked up at the University daily.
It would work, yes.
SL-BS50 or SL-BS64 is what you need for 8sp.
SL-BS77 is 9sp, all of these have a friction mode, which is handy I guess.
You can route the housing externally or under the bar tape, letting it exit at the first curve or on the top. Whichever would work better for you with the rack. You might need an inline barrel adjuster with the longer gear housing though.
As Vilms5000 noted, tektro rl520 is a drop bar lever meant for v-brakes.
Gevenalle mod tektro levers to accept a thumbshifter/bar-con.
They're rather pricey new, but do occasionally turn up used. You would need one based on the rl520.
There's also a printable 3d model of the shifter mount floating around if you're inclined to DIY.