They probably could be eligible to adopt
They would certainly be eligible to apply. However then the desire has to be to raise a child rather than have a baby.
The psychological screening is an awkward point. Anyone can have a baby, there is some screening through pregnancy for situations of too great a risk to the child, but people wishing to adopt need to go through intensive, invasive screening - and rightly so, in most part because of the vulnerability of the children but also because adoption is often born out of loss on both sides, it's not the first choice of the child or the potential parents, the parents have often dealt with fertility issues and loss in that way. The screening looks at the emotional availability and agenda of the parents to meet the real needs of the child rather than wanting a child to meet their own needs - however unintentionally.
As the Daleys found: a child being brought into the UK has rights of its own, and the first right is to ensure that it is with fit parents in a fit home. If commercial surrogacy is to become more and more of a 'thing' and potentially with state funding if reproductive justice also becomes a 'thing', then surely some degree of psychological screening should also be required. Equality would demand no, no more than any other person who can get pregnant from a one night stand. Common sense would surely need to say: this child about to be created has rights, including to ensure the potential parents do not view them as a commodity, or as an extension of their identity, and are able to provide a sufficiently stable home?
Not easy questions. But the rights and best interests of the child have to be put above the interests of the adults.