I think you need to consider the legality of what you’re implying here that a PH will do.
For example, shooting an underage lion in Zambia is not allowed, all lion have to be scientifically aged by a panel of experts before an export licence will be issued. If you contravene these laws, the ph can be suspended or have his/her licence revoked permanently. The outfitter will have huge penalties and likely have their future quotas removed.
The financial impact of this is huge, not considering the fact that when the outfitter then tenders for a renewal of a concession or a new area they may use previous records against them.
I think it is safe to say that the hunter needs to understand there is more at stake than walking away with a big fluffy 3 year old lion simply because that’s what he liked the look of.