/ Edelrid Kestrel 60m dry rope
Safety is always a relative thing. No, it won't be as safe as a single rope, or as two halves, but most of the time it would hold falls just fine (though it would be more vulnerable to being cut over a sharp edge). For alpine climbing you may consider that the gains in lack of weight and faff, and thus speed, outweigh the drawbacks.
Well for winter climbs you likely want a 60m rope, while for scrambling a 30m rope would do (and be half the weight and faff).
For British trad, two half ropes are usually better (to minimise rope drag), though you can use a single.
Other than that, any of the ~ 9.5mm single ropes (dry treated if for winter) would likely be fine.
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