I am wondering about retirement which is still someway off but I like to have broad plans way in advance

A common option just before and during retirement seems to be laddering individual short term bonds in your own currency to avoid currency risk and because they are less price sensitive to interest rate increases.
That's fine for people living in the US and Europe, but we don't have that option because JGB rates are so low and the massive debt/economic outlook is an issue too, as you know.
My current plan for retirement (not now) is to use a combination of
Yen in fixed-term deposits (abysmal interest rates might improve slightly by the time I retire)
Get a 3-7 year US treasury ETF (hedged) (average bond duration 4 yrs) (TSE ticker: 2856)
Hold on to some of my eMaxis SLIM Bonds (unhedged, average bond duration 7 years)
Consider Japanese MMFs if the rates are any better by then.
I will scale down the weighting for equities of course.
Any other/better ideas?