In true fearful form, I preface the following with I do not endorse the safety of what I do. I am just sharing what I use, and you will have to determine how to be as safe as possible. I’ve been using these. I like the VT Prusik better, but they both function well for an autoblock imho. The materials on the VT Prusik are more heavy duty, but for all intents and purposes, the 18” loop from bluewater works just as well. I keep one as a backup in case I drop the other.
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The 7mm VT-Prusik is a good option. I just picked up one. It might be a little long for OP though. I have thought of calling Bluewater and seeing if they could do a run of custom length of 7mm VT-Prusik. I would be all over that for Oplux.
To the OP, the way I see it is limit the length of ends coming from hitch to carabiner. If you have sewn/spliced friction hitch, you will be limited by the plastic covered area with the splicing/sewing.
If you use knots, you will be limited to the length the knots take up.
In my experience, the sewn/spliced distance is longer than the knots; however, The sewn/spliced is much stronger. Sewn/spliced can sometimes be ordered in custom lengths.
I would look to get a sewn loop (prusik, klemheist) or sewn eye to eye (distel, schwabisch) friction hitch cordage. And I would make sure I choose the right length. Unfortunately, I am not aware of where one can custom order sewn loops or sewn end to ends for friction hitch cordage for oplux.
If that is not available, I would try to make do with existing sewn options, e.g., jammmy or 7mm VT-Prusik.
And if that didn’t work, I would just get a length of cordage and tie my own loop or ends.
Those are the options I would take in order of safety having highest priority, and next, minimizing length.
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I have done this exercise for my 11 mm predator and have custom ordered sewn eye to eyes for my friction hitch cordage for that.
Last season, I added oplux and cut Beal jammy and made custom length tied ends and used a distel hitch. Right now, I have bought some friction hitch options for oplux and am investigating the best option for friction hitch cordage (safety, minimize length, ease of use). I need to get some tree time to make a final decision as to what I will use for oplux.