There has been a detailed discussion of this topic on the PTC Community recently. Please take a look at the discussion titled "
Logo on Creo part and drawing interface" for all the info.
Adobe Illustrator does support DXF output, so that should be a good option for you also. Once in DXF format, you can bring it into Sketcher or a Creo Drawing. I like the drawing option because you can scale the object a bit easier and export as IGES. Once the logo is in IGES format, you should be able to create a datum curve from file and import the IGES file with no worries about constraining the sketch in Sketcher.