Batman,
If you want to waste money on fancy pants oil that’s your choice,
These motors really don’t need it.they are an unstressed pushrod ,with a pretty good oil pump,
In my opinion they seem to be a fair bit quieter on a 20/50 classic.
You will soon know if the oil is getting too hot,
Edit I appreciate what mr boff is saying,however if you consider that the 1200 Gs when first introduced also had a 20/50 mineral recommended,
Sometime later the spec was changed to a full synthetic,
So service costs went from £3.50 to £4.00 a litre to @£17.00 a litre it makes you question the reasoning.