Not sure a Western Union splice satisfys ABYC mechanical requirement (should)...some experts do and then this would be fine if you are confident the solder is really doing it's job.
From Wikipedia...
However, when examined in
tensile strength ("pull") tests by
NASA on 16 and 22
AW gauge wire, even the short tie variation of the Western Union splice performed well after soldering: when spliced and soldered carefully to standard instructions, the test splices never failed at the splice (instead breaking outside of the splice area), leaving NASA to conclude that "the solder connection at the splice was as strong or stronger than the un-spliced wires."
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