Since cost is always important, even though they say it isn't, you can make almost any kit pen and substitute the kit nib with the 14k gold nibs that Anthony sells for $60. That will get you into the $200 pen range, and both of you should be happy.
If cost were truely no object, and you have a machine shop lathe to make fittings and cut metric threads, you can buy the $250 Mont Blanc, strip the innards out of it and make him a custom Mont Blanc with wood barrels. Other than doing that, you are stuck with making a pen from a kit.
The only European pen kit that I remember was a fountain pen kit from about 15 years ago. It was very high quality but a complex kit that required 5 different drillings, had a 14k nib, was made in Germany, and sold for about $75 at the time. It disappeared because of lack of interest.