What does the fiador bring to the table that something simpler doesn't? I suggest an alternative knot could be a bowline on a bight and then tying the two ends for the third loop (with a sheetbend or anything convenient).
Tie a bowline using a bight rather than a single strand. You will then have three independent loops which are independently adjustable. If two loops will suffice, it is hard to beat a bowline on a bight, IMHO.
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