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You can add BIRT support, it won't be too bad. Just look at source code on Github of report module.
If you want something out of the box yo can go with Jasper. See examples and tests within report module.
Seam 3 reports only bridge Seam 3 and reporting tools...it is not the repalcement of seam2 report.
If you are familiar with BIRT, use it directly. or use iText.