I always ease the sheet way out once the wind is substantially aft of the beam, until the top sheeted batten is athwartships and the boom almost as far out. The yard and upper, unsheeted, batten are usually beyond athwartships. Being able to do this is one of the benefits of an unstayed rig. I do this once the wind is more than 120 degrees off the bow, not just when running square. Arion has a standard, three-span, six-part sheet and I would overhaul it, that is pull some of the sheet through from the top to let the boom out further, then ease more of the sheet, repeating the process as needed until both spars were well out. Once I did this, I could sail up to 30 degrees by the lee without gybing, though I was leery if there was a good following sea and the boat was rolling. Blue Moon currently has upper and lower sheets, so twist can be easily controlled, making squaring the sail out even easier.
Accidental gybes in rough weather remain a risk even with the sail squared well out, either from sudden wind shifts or being slewed by a passing wave, but the risk is minimalised. If reefed, I tie a line around the reefed battens. I have experimented with a fan-up preventer, and like the idea, but have not yet perfected it. If you have full sail up off the wind and the sail is squared right out, without twist, I agree with Arne that a Chinese gybe is not going to be an issue. Hopefully, you will only be running under full sail in light to moderate winds. These days I reef early when off the wind. The boat does not slow down but all the loads ease off.
With the sail squared out like this, the wind is almost on the beam by the time you have completed an intentional gybe. The sail still comes across with unnerving speed but is almost feathering once it is over. It is important to sort out the deck so that the sheet does not snag as it sweeps across. I basically do a flying gybe, leaving the sheet cleated at the squared-off position, but try to haul in a bit of slack in the sheet as the sail comes across, letting it run out again through gloved hands as the boom passes overhead.
I feel there is no need to fear the Chinese gybe if you trim the sails correctly, and if you use some sort of restraint at the leach (either an FUP or a lashing) when reefed.