(sorry couldn't resist ha ha!)
The best bet for removing it is to pour lighter fuel on it.
Stay with me here, I learnt this on my Design degree, if you put lighter fluid onto double sided tape, no matter how strong it is it will remove it no probs!
You don't light it that would be silly.
Seriously it shifts stuff and shouldn't harm the paint at all.
I'm not sure what the material is between the paint work and the plastic badge, but if its pourous you're laughing.
I like the idea of a wire like dental floss or fishing wire, a spatula may be too aggressive.
I guess if you pour it on, perhaps leave it to soak in, although you don't want it to evaporate so whack a load on, and then use the thread to 'cut' through it that should help.
Either way the residue left will be shifted a treat with lighter fuel (like the stuff you can get at a newsagents, the pouring sort, Ronsol I think, its bright yellow)
Use toilet paper or whatever to wipe it off.
It works a treat on glass too especially!
Then depending on the colour of your paintwork and age you can go about Tcutting or polishing as normal to blend out any sun damage.
I don't recommend meths as that hazed up my last car a bit!
My silver 147 TSpark has also got the chrome text gone before I got it and I can't see any indication of them being there (haven't looked closely though)
It does look good without them.
Hey if any one wants them I have a '1.1' badge left over from my Rover Meetro, I might put it on mine for a laugh, or the next BMW I see ha ha!