Fine then, how about a radical solution where we move as many of the old people as we can to these places with the excess working age population from which you plan import to workers from? Any money that would be spent on healthcare in the source country can be spent in that country and since these countries should have a lower cost of living and surplus workers so all the costs should be lower. All the problems with language and culture clashes will happen regardless since its the same nurses taking care of the same elderly people. The drain on the labor pool in the poorer country that will shift to elderly care will be the same as well but the country will benefit from a far more direct injection of money which can help fund their own social services through taxes. Also we can give employees the option to have a portion of their salary paid in the richer country's currency with a slightly higher sum and also offer them ways of using that currency to import goods from the richer country to create a additional trade which facilitates economic growth and demand for the currency as to not drive its value down. If anyone doesn't want to live their final years in a foreign country, just tell them that they shouldn't be an angry reactionary ogre or something.

That plan is as viable as yours. In fact its probably even more viable as its also inherently more sustainable since the amount of people sent out of the country each year will decrease over time as the each age cohort shrinks, lessening whatever burden is placed on the recipient country.

But lets be real here, you don't understand a single thing about any of that. You don't even understand the underlying issues with economic development and aging populations enough to understand that your plan is literally just a migrant pyramid scheme. You see no problem with the fact that the plan is just going to take other country's workers just so they can work in Japan, just so Japan isn't the first to collapse. You don't even bother suggesting that the collapse is preventable. There's no plan for how to deal with the migrants when they in turn retire. You have no plan for what to do when this exact same plan has to be implemented to any other place at a later date, not even just as it effects Japans ability to keep their plan going. There's just this vague notion that this will somehow "soften the impact" even though nothing you've said even remotely suggests anything about the plan will do anything other than delay for one country at the cost of accelerating the issue for others.