I have heard of people adopting locally via the national Adoption Guild but it is quite a lengthy process. They also only allow straight couples and the potential parents have to be 21 years old and above with at least one biological child, which I think are rather restrictive requirements. Unfortunately, the society here tends to be judgmental towards non-conventional families so these rules are in place, I assume, to increase the chances of a successful adoption.
On a separate note, have you considered parallel parenting? It might be an option for you!