I'm looking for a way to keep my original HH ULBA tie-out lines intact but get more/easier adjustability (as opposed to using the HH figure 8 lashing).

I'd like to use SMD rings / garda hitch and attach them to the HH tie-out lines right next to the hammock with a larkshead knot. Tie-out lines would then go to the tree huggers and back to the rings for final attachment/adjustment.

Is this advisable, or would the knot weaken the line beyond a safe working margin?