We use either blue spray (antibiotic) or purple spray (antiseptic) on shearing nicks at the time, then keep a close eye. Stockholm tar if necessary (which is rare here for shearing nicks, but is sometimes necessary for foot/leg wounds) and your favourite fly repellent if needed.
Agree other comments about Clik, useless to stop flies.
Crovect does have a fly repellent action but be aware it will sting on damaged skin and can cause cracking / hardening, so you need to keep an eye and be ready to use Sudocrem or similar to treat skin which cracks or hardens.
With where you are now, I'd be cleaning the wounds thoroughly, flushing out with salty water, apply fly repellent. Use Stockholm tar on clean wound if necessary. (But wounds will probably benefit from daily cleaning for a few days first, by the sound of things.)
If you need to get them out of the way of flies' attentions for a few days while you get the wounds clean and healing established, do you have an airy barn they could go in?
If you have or can get the Red Fly Traps to hang nearby, they really do catch a lot of flies. Or for indoors, if the flies are still pestering, the zapper thingies they use in restaurants do work.
Non-chemical fly repellents (such as citronella) need reapplying daily at least. I haven't used any of the "yellow gunge"s so can't compare their usefulness to other options.
Spot-On works for keeping flies away but is heavy-duty chemicals so comes with lengthy meat withdrawal, and cannot be used in sheep producing milk for human consumption. (Although cattle have 0 milk withdrawal, so it's probably that they haven't done the testing.)