Have just read this thread for the first time, sorry to hear about the recent damage.
Tnought you might be interested to see the following pics/description as I recently fitted a later front panel to a '72 bus but wanted to retain the correct look.
I must admit I wasn't too fussed about the raised badge bump as I've seen them with a larger VW badge right over them and it's barely noticable. I decided it was better to leave it there than risk introducing the opportunity for more rust by cutting it out and welding it it flat. (no chance of distortion either by not touching it!)
The new late panel took a bit of fiddling to get it to fit perfectly but I was very pleased with it.
I then blanked off the top indicator holes and modified the grill aperure to have rounded corners instead of the much squarer later corners....................
A thin skim of filler......................
To fit the new lower repair panel I cut back the main panel just below the raised centre section, leaving enough metal below to weld to.....
The new lower panel fitted. In the indicator holes you can see the brackets I'd made for securing the indicators as the repair panel does not have these fitted and the originals were too far gone to transfer them from the old panel.......
The completed panel......
The whole conversion part was straight forward and relatively quick. Fitting the main panel panel was actually more involved and awkward.
Cheers