Quoted from Pac-Fan:
I am working on an alternate solution costing much much less than a $100 board or soldering 120+ wires underneath the playfield. I have a prototype completed, tested and working, and am considering offering something up if there is enough interest. It would be completely plug-n-play and not require removal/replacement of any board or soldering or underplayfield access. The cost to fab the boards would be significant so would need to judge demand before I take the plunge LMK if anyone is interested, and I may consider this this summer.
I would be quite interested. Probably 7+ boards depending on cost.