Well, from what I am finding the majority of "min-chef's" knives I am finding in stainless are western handled. A lot of the wa handled (traditional Japanese handle) are either carbon steel or a carbon core with some type of cladding, be it stainless or softer carbon. I will say though that western style handles done by Japanese makers aren't exactly like a lot of the actual western knife makers, if that makes sense. Some I would personally still classify as a Japanese handle even if it isn't a wa handle. It is pretty much the Japanese take on what western handles are like.
One wa option I found is a little Shun: http://www.chefknivestogo.com/kesa6.html
It is a wa style handle (I almost think of it as a western style wa... lol) using pakka wood which is a resin impregnated pressed wood, so it is VERY stable and should resist water well. It is also 5.5" and a santoku blade design. If I remember right the santoku is actually a chef's knife in Japan while the Gyuto is a Japanese take on a western styled chef's knife. I am sure someone will correct me if I am wrong on that one. lol
At 41mm blade height, it might be a bit tall though.
Another option, but it is western handled: http://www.chefknivestogo.com/hapakn1.html
This one is a beautiful knife at 5.3". The blade type is a petty, which as I understand it is a utility knife for all around use. The handle is a good example of a Japanese western style handle. To me they just seem thinner and more elegant than an actual western handle which can be kind of thick and burly. lol
The last one I'm putting here is a Richmond Artifex utility/petty: http://www.chefknivestogo.com/riar15pe.html
The handle is a western style, but it seems like a mix between Japanese western and actual western. It looks like there are a few more contours than what I see in most Japanese style western handles. Again, I could be wrong. I just had a quick look at the site to see what might fit in your criteria.
To make searching a little easier, 5.5" is about 140mm and 1.25" is about 32mm. Probably your best bet for this size is some sort of petty.
Hope some of this helps! lol