No need to replace front plate on Q7 unit you can just cut off edges as I did it.I used a modified metainfo2.txt file with the Q7 767 firmware. There is some information on a German forum digital eliteboard about conversion of the A8 5F unit, the problem I found is they are not very help full even if you try and post in German, and some of the posts with the useful conversion information have been deleted. So I gave up asking and made my own file. Another way is to buy a Q7 5F module and change the faceplate, the downside is you have to find an A6 or A8 faceplate.
3G+ appears to be a popular retrofit in Germany & Russia but I found very little information on English forums. I'll do a full write-up once I'm finished.