While waiting for my new accurate PH meter to arive, I searched a little more on basifying water with lime.
I found a site several substances with their PH in solutions are displayed. Also here explicitly mentioned that a saturated solution with CaOH has a PH of 12. So most probably lime will work equally well for a aqueous foodsafe A/B.
In fact it did already worked for me sort of speak with blended cactus which was quite watery with normal active yield.
Taken from the following link:
Caveman to Chemist Projects: Lime and Lye :
'But the solubility of calcium hydroxide is only 0.19 g/100 mL. That is, no matter how much calcium hydroxide we add to 100 mL of water, only 0.19 g will actually dissolve. Even so, a saturated solution of calcium hydroxide has a pH of 12. '
The more I think and read about it, the more it makes sense to me that making a concentrated tea first is the way to go.
Most probably a lot less d-limonene can be used as the ratios for other solvent aqueous teks are 3:1, no ugly cactus mud separation and even a lot less lime could be used. The tea as the basis for an extraction also seems the preferred method for most skilled chemistry oriented Nexians as I read in several topics. Next week my new cactus chips will hopefully arrive and I'll write a report extracting it this way.
Also I'll describe how I built a ultra low cost 'getto' magnetic stirrer based on a DIY internet design which can be very usefull in the extraction.
The only disadvantage I see so far is the boiling/straining process which will take some time extra opposed to the 69Ron drytek.