For the Arab states I have some theories on how they might come out of the 2nd Arab War.
1. UAR: Destroyed. The polity will be dissolved into both new states while losing territory outright to victors. Territory may be lost to Turkey, South Iran, Lebanon, and Israel.
Kurdistan will be created from the Northern part of the Former Iraqi kingdom, a project of the West over the objections of Turkey with the goal of creating a new democracy in the region. Also sponsored by Israel if the Kurds face strong persecution seeing a kindred spirit and natural ally in the Kurds. Italy gets Turkey to reluctantly accept claiming it will serve as a dumping ground for Kurdish extremists that refuse assimilation, and enduring fear of an Arab revival will keep Kurdistan from getting hostile with Turkey.
A Shia majority Iraqi Republic is established with its capital in Baghdad.
2. Oman: Separated from UAR and subject to British occupation before being deemed for for self governance(ProWest).
3. Yemen: 'Liberated' but Italian forces from the AOI who install the exiled Crown Prince as Sultan. The state gets brought into the RA and while subject to strong Italian presence actually gain territory at the expense of Saudi Arabia and investment from being in the Roman sphere.
4. Lebanon: Conquered with aid from the Maronite resistance, it is decided to treat it as liberated nation rather than a UAR member state. The Italians and Turk Cooperate with support from the Israelii Right to set it up as a near Fascist State controlled by the RA's allies. May gain border adjustments in is favor.
5. Saudi Arabia: After its first great losses an facing invasion the King is overthrown by his brothers. A brief Civil war ensues with the new Sultan asking the West for aid against UAR loyalists. The Sultan wins but Saudi Arabia's new regime is still seen as collaborators, just opportunistic ones. Yet occupying the country or meddling too much with it is seen as more trouble than its worth with Mecca and Medina in the equation.
So while the new King remains in power he has to concede border disputes in favor of the local allies of the victors, concede certain control over oil, and commit to some minor democratic reforms. Saudi Arabia survives but faces a troubled future, not truly trusted by the West and regarded as traitors by Arab Nationalists; and hobbled in exploiting its oil wealth.
6. Morocoo: This theater turns mostly into a sideshow, with it mostly being Spain vs. Morocco; with support from French Colonial forces assisting Spain. Spain wins but not a crushing victory. And with the West not wanting Franco to run wild he only get minor border adjustments, money, and Morocco's recognition of his colonial holdings. While the Sultan survives in power his regime comes under increasing pressure after this failure.