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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,170
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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If you can get by with just a smaller granny gear by changing the 30 tooth chain ring for a 24T ring as was suggested above by Cyccomute, I suggest you do that. It is low budget and gives you much lower gearing.
For almost two decades I have been using a road triple that came with a 30T granny gear that I changed out to a 24T on my two derailleur touring bikes.
You might find that you have too much chain length when you are using the smallest chainring and the smallest sprockets in back, a rear derailleur can only take up so much slack. But you should not be using your couple smallest sprockets in back with a small chainring anyway because that is badly cross chained. For about a decade I was having to avoid a couple gears because my rear derailleur did not take up all the slack, no problem as those were not must-have gears anyway.