I also have a Lion bell mounted on my (quill) stem; the handlebar fitting works fine for this, but they make spacer mounts for threadless setups.
Apologies if you've been through all this, but when travelling internationally by bike you don't need to meet all local requirements; under the 1968 Vienna Convention on Road Traffic, all a bike needs when crossing borders is:
-An efficient brake
-A bell – and no other audible warning device
-A red rear reflector
-A red rear lamp
-A white or selective yellow front lamp
See
http://www.cyclinguk.org/cyclists-library/regulations/international-traffic for more info.
If I've read that CTC page correctly you don't (eg) have to have the bell or lights (in the daytime!) when in France, as they don't require either in their regs - you just need the lesser of the Vienna or local requirements.
Again according to that page you're ok with battery lights in Germany, but I'm not sure from a skim reading of the convention whether they have to be StVO-compliant; I suspect 'legal in your home country' would be enough, but that probably means BS-compliant rather than anything else - though I suspect that unless you fail the attitude test you'd be ok, as long as you weren't eg dazzling the oncoming Polizei patrol...