Thank you, DGP. I'd not considered rocking the transmission. It makes a lot of sense, as it can be at any random angle when checking. The instructor may have gone over that in the initial training for the 206, but I don't think so. Thanks to the contributors above, I won't attempt to add any oil to the transmission unless I just can't get any to show in the sight glass, when hot, and while rocking if necessary. Based on five years with it, I don't expect to.
That's great advice about the hose, too. I'm going to see whether I can procure replacement parts (to give to the A&P) for