IIRC the old pump was 8.5mm plunger, the new pump is 9mm plunger but it wouldn't be the first time I was wrong lol. I had the same thought as you, maybe Ken could get a standard stroke or 10mm stroke with the large plunger and still achieve his goals while lessening some of the loads the eccentric shaft would see as the ramp angle would be far lower.Industrial Injection has their XP line of CP3 pumps that are both bored and stroked. From what I understand, they have 2 levels. Stock plungers are 7.5 mm, the standard XP pump bumps that up to 8.5 mm, but I hear they also have one that is 9.5 mm. They are all a 12 mm stroker pump, but I'm sure they could do something custom for you if you called them. I installed one of their 8.5 mm pumps in a customer's truck after talking to a few people who have run them, and it is working good so far, but I have very little run time on it and can't speak to the reliability or longevity.
Rough math puts the following pumps/dimensions at X flow per plunger per stroke (note, purely volume calculation not a direct fuel output value):
-Stock CP3 (7.5mm bore x 8.2mm stroke): 362.26mm3
-10mm stroker (stock bore): 441.79mm3
-12mm stroker (stock bore): 530.14mm3
-14mm stroker (stock bore): 618.50mm3
-Old II XP (8.5mm bore x 12mm stroke): 680.94mm3
-New II XP (9.0mm bore x 12mm stroke): 763.41mm3
-Custom 9mm bored x stock stroke: 521.66mm3
-Custom 9mm bored x 10mm stroke: 636.17mm3
Based on those quick calcs, a stock stroke custom bored pump would come damn near his current fuel volume.