Brain,
Sorry I'd
lost track of what you were using.
If you are using all chain then add a snubber, if you are using chain and nylon combined then you have no need of the snuubber (the nylon part of the rode performs the same purpose). I had thought you might lie at an angle to the wind if you brought the nylon (part of the total rode) or a snubber over one fairlead and I was only suggesting a prussik on the other side to central the load. In light winds you simply would not need to worry (about centreing the load) but I might have it ready in case.
I would not use the bow roller, other than to store the anchor. You seem quite happy to deploy and retreive by hand and though the bow roller might not be very robust it looks as if it might be somewhere sensible to stow the anchor, lashed to one side, and until you have another option - the bow roller as anchor
storage looks sensible.
I'd resist expensive modifications until you have defined exactly what you want/need - so go out and get some background to the issues - you might find that a
windlass become a priority (don't know). But we are basing our comments on some not very detailed
images, no knowledge of your desires (in terms on
anchoring and the yacht) and no knowledge of the
depth of your wallet (nor even whether you will keep the yacht for long).
Get out and try and enjoy it - then come back and we may have a new set of 'contradictory' (maybe that should be 'different') ideas for you to mull over
Jonathan