Not sure if this is going to help but I used to work for a signwriting shop and had to de badge a lot of vehicles. I used to pour boiling water over the badges first which made them slide of very easily with the fishing line.
Just did mine today.
Heatgun for about 5 seconds then ran floss under the badge and cleaned off the rest with Methylated Spirits.
Took around 5 minutes or so and the results are VERY good, no sign at all of the old badges.