Looking at the Jump planner it would be possible to go from Z30/MN5 trough Hophib with a JF or trough Ertoo with a Carrier with Jump Drive Calibration 3 and Jump Freighter 3 to get out of Fountain without touching any EZ, SOT or PL systems that might be cynojammed. These are also npc space so no worrying about other alliances taking sov and putting up a jammer either(but for all i know they could be heavy infected by player pirates). What would then be the best lowsec system to aim for to use as a close to highsec base?
Pashanai is quite decent, a bit far from jita (15 jumps or so). It is high sec for the JF, the carrier would in that case base in a neighboring system. (beke or Leran).
Seems to be the common route for the alliance and I think they have poses in some waypoint systems that could be possible to use. (safer than a station I guess).
The question is how far from jita do we want/need to be with the logistics base?
I would in general avoid hophib, lots of reds base there. As for cyno jammed systems, I think that cha2 and al8 is clear of it some of them also have cyno beacons (not sure how they work).
I'm not sure but when PL made the sov4 constellation they said something that it was offlimits for everything but use as a jump point, would of course have to dig that out.