7 piece of 120 sided dice? At this point, i would just use the money to buy a hardware wallet and keep the change.
True, but they are re-usable forever. No hardware updates, etc.
Also, this seems to be turning into a bit of a thought experiment. Which is good. Someone, ColdCard, Who I like, came up with a dumb marketing idea. Lets work on a better one, that does not have to be marketed.
By the time you get up to a 120 sided die, you are on 6.9 bits of entropy per roll, meaning you only need 19 rolls to generate 128 bits of entropy. At that point, it's going to be far easier to just roll 19 times than mess around with colors and orders.
But messing around with dice is fun. Unless you are in a casino playing Craps, then messing with the dice will get you thrown out :-)
Yes, the larger number of sides does let you roll less. But I figure if you are going to do it with dice then go all the way and use as much entropy as possible.
-Dave