Capcom Impress CP layout help

[SuperNole]

For those that has read my other posts about my monitor problems in my Impress, I am glad to say I bought a new 29" monitor and everthing works great.  Now, I put all new Seimitsu sticks and buttons in.  I also added a credit button.  The last thing I want to do is wire the CP for a 4th button for NeoGeo fighters.  The cab already has the 6 button Street Fighter style layout and there really isn't enough space to add a 7th button to either 1 or 2 player.  Is there any other solutions?

[elvis]

All new candy cabs that don't have the "7 button layout" do one of the following for Neo.

Either (a) use the first 4 buttons on the left in a quasi-diamond layout or

(b) if they use the layout where the bottom left button sits out towards the left a little more than the top left button, they use it in conjuntion with the top three as a sort of arc. 
See the P1 side of this CP:
http://candycabinetcity.com/images/newastro/arcade0038tf.jpg

And imagine buttons 4, 1, 2, 3 in an arc.

Note that the Capcom Impress doesn't use that second sort of layout.  It's buttons 1 and 4 are directly above/below each other:
http://candycabinetcity.com/images/impress/CapcomImpress1.jpg

As such I'd recommend (a), unless you're willing to drill a hole in your CP to achieve the 7-button Neo arc layout.

Here's an example of the LS Sound 29 that has the 7-button layout:
http://www.gamedude.com.au/arcade/images/candy002.jpg