Yes, it's a gnarly problem, unfortunately. And I don't think there's any way to fix it, which I guess will mean 103s will be useless for Seca2 which are using high ident numbers.
I didn't try the 00 33 Taquilla ident on my friend's 103; it didn't last long enough. So I can't remember precisely where the cut off point comes for 103s and idents. But it is around that mark of 00 33 or 00 34. Certainly, Stream at 00 37 has never worked on a 103.
My friend was hoping a way would be found to make those cheap Pace ITVDig boxes designed for FTA take a CAM, then sell his 103 (which as a result might have become quite marketable) and moved up to a 105. But that looks doubtful, at least for the moment.