The issue is becoming to complex here. Suggestion- buy the EJ41 strings. Tune to standard tuning. No need to tune down lower. Place the capo anywhere you like and play. 12 string guitars are complicated enough without the needed burden of changing string tunings other than perhaps drop D. Instead of drop D- place your capo on the second fret strings all except the low Es and you now in fact have the effect of drop D but the beauty is you still can make standard tuning shapes except in E & A minor but can even be creative with them.