Take one or two domestic flights and accumulate miles on your JMB account. When it gets to 10,000 miles, and you're not far from it, exchange them for JAL coupons - the lowest reward level currently is 10,000 miles for a ¥15,000 coupon.

Usage of coupons can be found here:
http://www.ar.jal.com/world/en/jalmi...rd/coupon.html

Or, if you have the SPG Amex card or other cards that can transfer points to your JMB account, add 2500 miles and do the above.

Instead of thinking of transferring out, think about transferring in the minimal and use it. That's what I would do anyway, cuz you always lose when you transfer out.