sorry to post sensible suggestions in here,not normal i know
if you wanted to screw fix the badges i can put you in touch with someone who could make some blind "slugs" and solder or braze them in,
failing that if you decided to go for stick on ones you could put them on wet.
use a really weak mix of washing up liquid/water and slide them into position,then push them on .
this will allow them to stick and the water will dry out,they will stick as normal
i used to use this method when fitting decals to vans and it will stop the initial grab of the adhesive allowing you to float them into position.
it worked really well and i see no reason why it would not work on smaller stuff
carry on chaps
Don't come in here with your helpful, sensible suggestions Mikey. Unhelpful, catastophy causing suggestions are the order of the day in this section, preferably ones that involve blowing a large hole through his tank and taking his eyebrows off in one hit.