Rob - I have been 'full circle' on my old Claud Butler tourer which I have had for around 28 years. It started off with drops, and as been through flats, risers, straight with bar ends, butterfly and now back to drops. Only the frame is left from the original bike, but that is another story ;-)
I put the drops on to decide if I liked bar end shifters before ordering my Sherpa and:
a) liked them and ordered the Sherpa with drops,
b) kept the drops on Claud as of all the options I prefer them.
With a few changes of stem I didn't find it too difficult to get each set of bars in a comfortable place, so I would suggest you try drops on your Raven and experiment with stems to find what suits you. It is not difficult to pick up stems from eBay so this need not be an expensive exercise.
Edit - I did try an adjustable stem at one point, good for experimenting, and only one item to buy/fit, but it creaked and groaned for much of the time so not something I would want on the bike long term.
Similarly, the Vee brake compatible levers are not too expensive, and the Dia Compe Bar End Shifter work fine.
hope that helps
sdg.