Like I said before, the Louisiana and Texas builders are very accomodating. I suspect that most or all of them would build a box for you whatever way you want, including LMMM reed setup.
The only problem you may run into is cost. Reeds are ordered in bulk with the MMLH setup. The setup you are requesting would have to be special ordered or pieced together.
An accordion like that would have to be special ordered because of the fact that a reed set up of LMMM takes up more room inside the accordion than LMMH when you consider that 2 banks of reeds lay flat in the endplate and the M reeds are taller than the H reeds.
So can any of the other builders and probably at a much cheaper price. Don't over pay for such a small change. You are going to pay a little more but don't get shafted. Call Elton Doucet, Church Point, La.
Blickenstock - welcome to the forum! Can you satisfy our curiosity by telling us what kinds of music you like to play, and what sort of accordions you play on?
I've got a one-row Bon Cajun in C and a C#/D Saltarelle Nuage. Seems like I play mostly Cajun and zydeco on both boxes, but I have hopes of someday de-coding the C# row and adding to my Irish and Quebecois repertoir.
S'b'B
I'm learning to play a (Cajun)by John Roger in the key of C. I like traditional cajun music and also Mississippi Delta Blues. Plan on trying metal body resonator slide guitar with cajun music when I can.
That's a nice sound combination: have you heard the Lost Bayou Ramblers? Andre Michot gets some great gritty boogie going on the World's Cheapest lap steel.
S'b'B