Flat file via JMS - how to (most easy)?

Hi experts
My scenaio is R/3 -> XI (technology not decided) -> legacy system (via flat file structure and JMS)
I would like to find the best way to do this. The receiving system only takes a flat file with 150 char length in each line.
Until now i have tried to do this using test message to XI and then do a pseudo mapping to a XML structure. This XML is then parsed to a flat file in the JMS adtapter using module localejbs/AF_Modules/MessageTransformBean. This "parsing" is a rather time consuming solution and im not sure it is the best solution.
I just saw a how to guide explaning how to make a flat file from a IDOC-XML using ABAP mapping. I could use this by just making sure my IDOC segments was 150 char length. The downside of this is that XI is reduced to a IDOX-XML transformer and hides no complexity for the R/3 system.
What do you think is the rigth way to go? Is there an even better solution?
Kind regards
Martin

The mention HOW TO guide is:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/46759682-0401-0010-1791-bd1972bc0b8a
And I sould mention I would like to also receive data from the legacy system (wich also sends files with 150 char lines)

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Hi above all
Thanks for your reply,
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Flat file via JMS - how to (most easy)?

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