Since I'm a fan of the soldering iron and screwdriver, I'd probably be thinking about changing the connector on the board. Then again, I'm known to do some unreasonable things to make an existing connector work.

One thing comes to mind. Find a 10 pin plug with correct pitch (my guess is 0.10"). Then, file away at the plug body, removing retainer and orientation tabs. You might be able to get the plug to slide into the connector allowing you to get on with the project. If you can find the correct connector at a later date, the same jack body is still on the circuit board.

It's a thought.

Edit:
If you have a ruler that does 10ths of inches, 10 pins would measure exactly 0.9", if it is 2.54mm spacing. 2.55 would be visibly longer.