ORC 2923.16 (K)(5)(a)(ii) states a loaded magazine must be stored in a "container that provides complete and separate enclosure", those magazine holders would not qualify, and I can't see how adding paracord would help.
I could see where (3) might allow a holster as long as it was in plain sight. It will be interesting to see other opinions though....the firearm is unloaded, and the firearm is carried in one of the following ways:
(1) In a closed package, box, or case;
(2) In a compartment that can be reached only by leaving the vehicle;
(3) In plain sight and secured in a rack or holder made for the purpose;
BTW, welcome to the forum, and congratulations on transitioning from "self defense" to "family defense"!