Not all forms of mirror biology would even need to be restricted. For instance, there are potential uses for mirror proteins, and those can be safely engineered in the lab. The only dangerous technologies are the creation of full mirror cells, and certain enabling technologies which could easily lead to that (such as the creation of a full mirror genome or key components of a proteome).
Once we get used to create and deal with mirror proteins, and once we get used to designing & building cells, which I don’t know when it happens, maybe adding 1+1 together will also become easy. This suggests that, assuming upsides are limited enough (?), maybe better already to try to halt even any form of mirror biology research.
Would you personally answer Should we be concerned about eating too much soy? with “Nope, definitely not”, or do you just find it’s a reasonable gamble to take?
Btw, thanks a lot for the post; MANY parallels with my past as more-serious-but-uncareful-vegan until body showed clear signs of issues that I realized only late as I’d have never believed anyone that healthy vegan diet is that tricky.