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DO NOT USE A PRUSSIK! A tensioned line line that will experience 5x your weight (when just hanging there doing nothing) at the terminal ends. If you are suspended from that line DRT then at times you could be doubling your weight.
100kg load might become 200kg. Which puts 1000kg onto the ends of that tensioned overhead flyfox line. Prussik and even ascenders etc are know to slip and tear sheaths of rope above 600kg of force. The tension has to be held with a friction drum etc and backed up perhaps with two prussik's. One end obviously tied off.
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I dont know of any literature explaining the forces involed in this type of set up. Does the 5x the load come from pretensioning the line with a drum?
If so, does this mean that if you use a line that is only pretentioned by hand that the forces on the tie in points would be closer to double your weight?
Similar forces to a set up with climing line runninig through a pulley that is being held up by another rope that runs over a branch and is tied off at the base?