Just move the decimal place over one (to the left).
10 to 1 "reverse stock split".
Totally psychological.
Doesn't really do a damn thing to the coin since the decimal places [edit: fractional-part/mantissa] on cryptos go so far out.
Affects *everyone*.
Doesn't screw over new adapters.
Reduces the insane number of printable (calculable?) coins.
[edit: And yes, that would reduce the block reward to 40.]