There are extracellular and nucleus prolactin receptors. Prolactin binds both and this drug, as it's an antibody, only binds to the extracellular receptors giving us an idea of what effects anatagonising the extracellular receptors does but does not tell us what the nuclear receptors do and therefore cannot show the full picture of what prolactin actually does.
There exists many case reports of hair loss from dopamine agonists, so your suggestions may be harmful in this regard.
Estrogen receptor alpha for example has different effects than estrogen receptor beta for hair growth is an example of the flaws behind what people infer from this study
