Good idea, KidForex
If you have 74,000,000 yen or can borrow this amount at 0.15% you may sell JPY and buy AUD. If you do not hedge this closing side you probably will collect the interest rates difference.
However, I am not so sure about USD/JPY is oversold. It was going down on fundamental reasons. Of course, Japan is now done with its H1 repatriation and exporters will not sell USD so much. But, the economy of Japan is in not so bad shape and market has good expectations for Japanese stocks. Nikkey-225 is on uptrend and global investors are likely to continue buying them. I believe that was the major reason of breaking 115 resistance.
From tehcnical view, USD/JPY is on downtrend from 135 since Ferbuary-2002. If you plot the channel down, it points to 103. So there is real opportunity for JPY to test 102 this November and big four years old low 101.20 .
As for AUD/JPY, it is in correction mode with support at 74-73.80. Depending on you time frame, you may call it downtrend.
So, better try to get in AUD/JPY long position at this level.
If, however, AUD/JPY breaks 73.80 resistance, it may go down to its up-channel support at 71.
So what?
Just simple AUD/USD long looks better for me. It broke 0.6750 resistance and probably will test 0.70 and then 0.74 in long term.
It is your call, KidForex. I am not so sure about the second leg of your cross going up in several months.
NOTE: it is a long term view. Short-term traders should not pay attention !
Take care
P.S. btw, you will count your JPYs, not USDs after closing this position.