The assumption seems to be that you are talking about your home mooring. In that case, my choice would be to use one of the big flat buoys from Hippo marine and which can be fitted with a largish galvanised ring bolted through the buoy directly to your mooring chain. Then use a Swiftiematic or similar gadget which threads a rope through this loop as you bring the cockpit up alongside the buoy. With this approach you will never miss - or at least I never did.
I had a buoy with a galvanised ring on as you suggest. It does make mooring pretty easy and you can secure your tender to it with a simple permanant loop in the end of the painter.
However they bash hell out of your topsides. Mainly in light airs when the boat rides back onto the buoy.
I'm often single-handed, and I find that the ludicrously-named Handy Duck is a brilliant help! Just so easy to attach and, just as importantly, to detach. Amazingly strong too.
Run a moderately slack line from the bow cleat to the cockpit make sure that you have a loop large enough to slip it onto the rear/cockpit cleat. pull alongside the bouy slip the line with the loop through the bouy ring and place it over the cockpit cleat now pull away astearn, gently from the bouy and the bouy will take itself up onto the bow (thats where the small amount of slack in the line comes in) you can then either take the cockpit loop off the cleat and walk easily up onto the bow and tie the vessel off properly or using another line make yourself fast to the bouy, releasing the existing line. With any wind you will find that the vessel will turn into it OK with tide too you need to use your judgement a little more.