Thanks for your thoughts. I was hoping not having to make a long post to explain, but here we go.
1) Shure explains that only a few of their mics work with the BLX1. If the Beta 53 had been one of them we would have been fine. They do not explain what the limitation is, so hence my post here. This is not all about the pinout.
2) Why put an expensive mic on a cheap WL system? Well, a good mic is always preferable over a cheap one. The DPA is the industry standard around here. Everyone will accept it. It uses an adapter, so it can still be used if the wireless system is replaced with another brand. The owners of this system already have some channels of BLX handheld and would like to have a few headworn too for flexibility. They are not prepared to change out the BLX at this time, but are thinking that the DPA mics can serve them for a long time.
3) Artist bringing their own mic. Fair point, but not the consideration here. Although, more artists should do that. For their own good.
4) QLX, as good a system as it is, it is out of the question for these people at this time. Perhaps later. They may in the end upgrade with a used system of another brand, so that is another reason why the DPA with an adapter becomes attractive.
I hope that this explains the original questions.
Thanks!
Peder Berentzen