This is getting in the weeds. I find it hard to believe that you will use 6 memory saves on a daily basis. Prioritize the ones you switch back and forth to most often on 1 through 4. Problem solved.
Or if you have access to a PC/tablet, you could load up your backup files through the web address. You could write a script to load file of choice/automate this to the equivalent of a 1 click solution...But, i haven't tinkered with this kinda thing in a while. The inner geek in me took a hiatus
On a positive note, be glad that Yamaha, the BIG BOSS even lets you get this far. Count your blessings.