Re: Mixed octave strings on low end
No OM expert, but I've done lots of such experiments ....
I'd simply look up several makers' 12-string guitar sets, and see what gauges they're pairing for the D course (same as your OM) and the guitar E and A courses (just below and above your OM's G). That the scale lengths don't exactly match s/b irrelevant, as you're not trying to make an OM sound like a 12-string, but just get the right balance of string tensions.
Keep in mind that 12-string sets are often slightly lighter than the equivalent 6-string guitar set (and your OM process is NOT doubling the number of strings that were already there!), and you'll probably find an exact match for the OM's G.
In any case, I'd still consider this just a starting point... so it's good that strings are cheap!
- Ed
"Then one day we weren't as young as before
Our mistakes weren't quite so easy to undo
But by all those roads, my friend, we've travelled down
I'm a better man for just the knowin' of you."
- Ian Tyson
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