Being in the middle of the adoption assessment process myself at the moment I really think that there is no way you would be accepted as adopters. Your reluctance would quickly exclude you from the assessment.
Firstly, the process itself will continually tell him that it is a difficult undertaking. He will be sent on training courses about trauma, repeatedly told about the extremely challenging aspects of adopting children from abusive backgrounds. This will likely very quickly disabuse him of any notion that adoption is an easy ride.
Assuming that this deluge of information doesn’t knock some sense into him, the amount of work Involved in Stage 1 is pretty overwhelming. He will be asked to write a short novel about his life, his motivations, his history will be examined in ridiculous detail. He will have to gather together financial information, attend a medical, talk about previous mental health struggles. It is relentless.
You will have to do all of this as well. It is an onerous undertaking. If your heart isn’t in it then it will fall apart quite quickly.
Assuming you get through this stage, Stage 2 will involve weekly three hour interviews with a social worker digging into every element of your life and the strength of your relationship for at least four months. At least one of these sessions will be just you and the social worker where they will specifically ask you whether you are being coerced into adoption by your partner.
I just don’t see how you could get through this process without both of you being entirely committed to adoption.
We were made to go to a couple of information evenings before we submitted paperwork, and it was made very clear very early on that adoption was hard, the children were all traumatised and we needed to be 100% committed.
Your partner needs to start the process and understand how important it is for you to both want this equally.