It would be nice to find a 15mm
The Toptul European Style wrenches look very similar to the Elora wrenches.
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O K , cut the unused side off and weld on a piece of bar/round stock or pipe in any length you desire.

Granco makes a "long series" of line wrenches, but they have a "box" on the other end.
http://www.grancoind.com/catalog/wrenches.pdf
All of the ones I have are 3/8 heads, but with the small fm70a ratchet(3/8 head in 1/4 body), it would be like a 1/4 ratchet.
Hmmmm... The ones I have are snap on and they are in both metric and SAE, but not 1/4, will the bigger ones work? What sizes are you looking for?