This won't help me, but maybe it will help future shows, or future tours.
Having seen the absolute shambles of general admission entry in Vancouver and Seattle, I think a formal, structured solution needs to be adopted by the band.
Could future shows allow separate G.A. lines based on how tickets were purchased? So, for example, those who are longtime fan club members were assigned the "Red Hill" group when buying tickets. They would gather in a Red Hill G.A. line at the venue, getting first entry.
Newer fan club members were in the "Wires" group for ticket purchases. Day of the show they would be in a Wires G.A. line and be admitted once all Red Hill ticketholders are inside the venue.
Lastly, those who bought tickets during the public on-sale would be in a third G.A. line allowed into the venue after fan club members.
In short, three separate GA lines, each (loosely, but fairly) reflecting the dedication of the fans.
If U2/Live Nation still insists on using Credit Card entry, I would hope/expect there is a way to flag purchases along these same lines (Red Hill/Wires/Public).
I'd love to know what fans and moderators think of the idea.