I'm not going to say this is the best way to do it - in fact, I'm sure it's not - but no one else has responded, so I'll try it.
Is there any chance that you also have access to a SQL Server where you can link to your DB2/400 server? If so, the way I would get around it is to use SQL Server's DTS utility (stands for Data Transformation Services). I'm pretty confident you can accomplish what you need with little trouble if you have access to DTS.
I have used this site before and find it helpful:
http://www.sqldts.com/. There is also a guide on MSDN, but it's incredibly hard to find.