Sounds sensible. You may face problems in registering & insuring a bike bought in Europe if you have no address to use. The difficulties vary depending on the country.
In addition, some countries are regarded as being easier than others for a non-EU citizen to register a bike in. The UK is generally regarded as being the easy option. The language will also be in your favour.
Willing to help if needed. Try looking at
www.mcn.com for bikes for sale & insurance. You can get K100's quite cheaply here, as well as having a good spares availability in Europe.
Steve