However, your proposal to limit the amount in an address does nothing to prevent whales from selling large quantities of the coin.
How? They won't have large quantities after the hard fork date.
Yes, they will. People that own 1-10 bitcoins will have 63% of all of the coins. Furthermore, there is nothing that prevents people from accumulating large numbers of coins (as they have in the past) and selling them.
After the freeze:
Balance, BTC % Coins (Total)
(0 - 0.001) 0.14%
[0.001 - 0.01) 1.34%
[0.01 - 0.1) 7.19%
[0.1 - 1) 28.40%
[1 - 10) 62.93%