Not all Yemen has problems , only certain Isolated parts in Northern and Central Yemen , we have already done what you said providing Aid and loans but problem corruption is rampant there .
This is why I referred to seeking ties with Yemeni Tribes on border with Saudi Arabia , you know Yemen has been turned into 6 federal states now under saudi pressure , the next step will be building separate ties with border states and prepares in future it could involve giving citizenships to certain tribes living in those states.
Something similar to relation between KRJ and Turkey right now , but in Saudi case it would be stronger due to tribal links and same language .
Yemen could be given observer status but border states inside yemen will be given special one including al Houthis to .
Something else Saudi Arabia was always interested in having a land route to indian ocean under its influence , the current federalism in yemen fills this goal .