Ever considered filling the tyre with an off the shelf sealant (like slime) yourself?
I'm just putting that out there, I've never used the stuff, but I'm considering putting a can under the seat for some European touring I have planned.
I have a slow leak on my rear. I found today it was 21psi so inflated it back to 42, I'll check it next weekend and make a plan.
I also found the rear tyre has a 90degree valve and the front is straight so I couldn't use the compressor at my local garage and will but an emergency adaptor for it.
The slime stuff works very well, i had a slow leak in my rear tyre, which still had life left in it so i gave it a go.
Few months down the line i heard a pop one morning and saw a large screw had gone in at a funny angle.
Tyre didn't deflate at all so i rode to bike tyre place a few miles away and got mugged off for a new T30 as it was the best one they had in stock.
They won't repair a tyre with this stuff in, because it's just too messy, and they'd have trouble using glue so it's way too much effort, but it'll certainly get you out of trouble if touring.
Can be a bugger to put in the valve though, it's lumpy so you need something to poke it down with and preferably an air line to use as well.