U2o does not convert usfm references.

[LAfricain]

It's not a matter of converting random references, as orefs.py tool did. It's a matter of converting references already produced into a usfm that respects precise rules. As example:

\+xt Gen. xii, 3|GEN 12:3\+xt*  ; \+xt xviii, 18|GEN 18:18\+xt*  ; I\+xt I Sam. vii, 12|1SA 7:12\+xt*  ; \+xt Luc, iii, 23-38|LUK 3:38\+xt*).