Browntailwhale
You may be right at the moment, but very soon the EU will be asking you something like 'which part of no don't you understand'. I'm sure a deal can be brokered; simply allow JAR licensed pilots to operate EU registered aircraft in continental US, the same way FAA licensed pilots operating N-reg's in EU does. While the EU is very far from being a single country, it is a single market and the rules will be enforced.
Since the chances of JAR pilots poling EU registered aircraft in the US are somewhere between zero and f.all, you may safely stick your IPA dreams where the sun doesn't shine. If UPS will want to operate their own metal in the EU; no problem. Hire JAR licensed crew with the right to live and work in the EU and do so on EU registered airframes. Or they may outsource the lot to airlines like Star. As a previous poster told you, UPS will have to prove to the EU that pilots is a rare breed to find and hire, and if you belive that'll swim through legislation then I've got a french tower up for sale you might be interested in.
It remains to be seen what the EU postion will be for operations between non-EU and EU countrires, and indeed between EU and EFTA countries. It is not outside the realms of possibility that EFTA countries will be asked to follow the EU rules (which is very often the case already) especially since most EFTA countries are also JAR. That basically leaves you with Switzerland, which is not an EU or EFTA country. FedEx would probably be able to operate N-regs between CDG and ZRH, but not intra-EU. You are telling us that is worth creating a base for? Perhaps in the short term, but certainly not long term if the aim is for that base to perform European flying. The EU is, by the way, expanding and encompasses most of the continent already. Your IPA future, in other words, could very well be CGN to ZRH and MOW and not much else. Does that sound sustainable to you?
Your idea that different rules applies is, while still valid, about as sustainable as snow on a hot summers day. You may choose to ignore this with the arrogance some Americans are so sadly infamous for, but that won't change facts.
Sorry to burst your bubble by the way.