Font conversion can be controlled.
Go to the File\File Special\DXF-DWg Tranlation Setup Dialog's Settings in Selected Translator panel.
Here under the Attributes group, go to the Font-style conversion page.
Here you can define which AutoCAD Style is converted to which font in ArchiCAD upon opening or importing a DWG/DXF file.
What I would try is go to AutoCAD and check what font is used in that Style you are using for your fonts.
Then I would create a conversion rule to convert that Style to this Font in ArchiCAD.
That will hopefully help.
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