Just a follow up on my front mounted external oil filter almost a year and 3,000 miles later.
I am very pleased with the set up. Changing the filter is easy and involves no mess as an oil catcher can easily be placed under it. Re-fitting the new filter is also easy, as there is nothing in the way to stop you getting a good grip for tightening.
Plenty of people have looked over my bike and failed to notice it, so I don’t think it spoils the look of the bike at all!