I took original typ file from AutoDrive 3.05 and i modified so you can have two typ files to test and see the results.

First typ file you should try is the one with no polylines. This way you will get Garmin's default color palette for all road categories but you 'll maybe be able to keep original AutoDrive typ color palette for polygons and pois ...
If first typ fails then you go for the second typ which is empty, you'll get only Garmin's default color palette.

Use GMapTool to change typ files. Drag and Drop the img file together with the typ file in GMapTool then select "Change" Tab, then mark "Replace TYP file in img" and finally "Change Selected".

I've already tested both typ files with AutoDrive in Garmin Mobile PC, i had no problems, but you should test them from SDCard anyway, don't use internal memory. This typ files are only for Greek version of the map with FID 822 as i saw in your screenshots.

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Good Luck to you !!!