Any fix I work out on your site will get applied to github. That's just standard practice.
Taking an Akeeba backup and setting it up locally is really only something we do at the Pro level, as even with Akeeba, it can be a time consuming process - just generating, downloading, uploading, setting up the database, installing through Kickstart and then ironing out any kinks (like where people have used fully qualified links to their site instead of relative ones, etc) can chew up all the time a Standard sub pays for when reckoned by hourly rates. And if we start doing that for one Standard member, then it becomes a general expectation. And we have to have some support services which make Pro worth having, to help Rob and myself put roofs over our heads and food on the table.
That said, sometimes it becomes worth our while to do that, when we approach the point of diminishing returns with on-site debugging. If I can't track this down in my next session on your site, we may have to go that route, but I've narrowed down to here I'm pretty sure the problem lies (which is to do with using the concat label), and am hoping one more session will get it cracked.
Re your subscription - this is an issue which I am going to solve, regardless of your subscription status, as it's plainly a bug, and needs fixing.
-- hugh