The ad is in Dutch but... this man has a pair of 7-speed shimano brifters up for sale:
http://www.marktplaats.nl/a/fietsen-en-brommers/fietsonderdelen/m925494151-sti-set-7-en-8-speed-nieuw.html?c=8c285449651fa109c354bbabe740c1b&previousPage=lr
considering any old shimano rear mech (except old dura ace) should work with the 7-speed cassette that's what I would be looking at. Or friction shifting. Or holding the shifter cables under your armpits while riding.
@Smolders started
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The ad is in Dutch but... this man has a pair of 7-speed shimano brifters up for sale:
http://www.marktplaats.nl/a/fietsen-en-brommers/fietsonderdelen/m925494151-sti-set-7-en-8-speed-nieuw.html?c=8c285449651fa109c354bbabe740c1b&previousPage=lr
considering any old shimano rear mech (except old dura ace) should work with the 7-speed cassette that's what I would be looking at. Or friction shifting. Or holding the shifter cables under your armpits while riding.