Fitting a magnetic sump filter is a good idea.
I changed oil after the first 500km, after that I change once a year.
Fitting a spun oil filter to a ball bearing engine is a bit of a overkill.
And it does look rather out of place although that's a matter of taste I suppose.
However, fitting a spun on filter to a plain bearing engine is a good idea, as those type of engines benefits from really clean oil
Babbit bushes can take on some dirt as it will get embedded in to the babbit, but they also benefit from a external filter.

I have to add that this first 500Km was with a completely clean & fresh engine, no traces of old oil left in it.
+ a cast alloy sumpplate with magnetic plug .(I make those for the AOMCC)