As in 5 rows 7 columns? My flexible pcbs can be linked together for infinity columns.
https://www.etsy.com/listing/1367143291/dactyl-flexible-pcbs-4-and-5-high I'm out of populated 5r pcbs but I just got the pick and place machine populating diodes (I'm short on hotswaps but they're super easy to solder).
Wired I can do more of. Just order two I have spares for the extras I'll gladly just include. The actual cost in time is minimal for the extras.