I challenge the assertion that "there are so many gay clerics".

But in any case the Church's teaching is entirely separated from any theoretical consider of "welcom(ing) women colleagues".

And it is entirely irreformable.

The change in "other churches" appears to be highly correlated with their heterodox eucharistic theologies. Among Anglicans and Lutherans with "high church" notions of a sacrificing priesthood, acceptance of women as "priests" has been very limited.