I have my 5.85 on a swinging mooring for most of August. We clip to the bow D-ring directly to the riser chain with a Wichard forged snap hook
https://marine.wichard.com/en/stainl...ooks/part-2482 and suitable shackle to attach it to the chain.
We also have a pick up boy spliced to the riser chain a few links down, which is long enough (~2m) to act as a backup to the chain/snap hook should that fail - it comes over the bow loosely and cleats off on the foredeck.
Simple and effective. From talking to our local moorings chap (he does 100s a year) - try to avoid separate pick up buoys, multiple strops etc when it's not that big a boat - the friction in the system goes through the roof and then things fail at a far higher rate.
We leave the boat turned off but with the bilge pump on a bypass so it clears any rainwater.
Depending on where the mooring is - pay attention to tide depths and wind/swell as low spring tides/swell can be bad.