In general, it would not be acceptable. "A shrinking economy" can be interpreted as deflationary, and deflation destabilizes regimes in favor of something akin

In general, it would not be acceptable. "A shrinking economy" can be interpreted as deflationary, and deflation destabilizes regimes in favor of something akin to "strong man" dictatorships. See the interwar period in the 20th century for details. If you swing the value of holding just currency to where it grows relative to goods without doing anything, then people won't do anything. This spirals. Since nothing is being done, there's no work. You might have a black/grey market economy spring up but don't tell anybody about it. Specific to Japan, I am not sure. Depends on whether the demographic slack is permanent or temporary.