if they have yen-denominated debt, then they have added currency risk
if it is 1% of their cash position, they can just use some cash and buy yens and have those yens available.
if they have hedged the bond currency risk, then they might as well have hedged it after buying yens in the open market
if it's 1% interest, it is still probably more than the interest they earn on their cash position.
just saying...
(MAYBE, maybe, its a tax issue)