Hi Akaali,
Firstly I should say that I have never tried to flatten a leather shield. The normal way to reshape leather is to wet it and then dry in some sort of jig to keep the shape you want, but I would not be too keen to do this here in case the decoration that is left is removed altogether. Perhaps a better way might be to use a source of steam on the under side, and some sort of adjustable "clamp" to GENTLY flatten the shield as it softens. It would be a pity to crack the surface in the process.....
Just an idea anyway.
Stu
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