One little thing, in that instance I'm not so sure the CTA is automatic, ie, when it comes mid-war. The only CTA I'm sure is automatic if possible to send at all is the initial defensive CTA when the war is declared. Note, however, that as long as you have the enemy below -25% warscore they just can't CTA anyone anyway. They also can't if the war is longer than a certain length. So if you're using the distract their allies with some other BS war to prevent CTA trick, you can end the BS war once the real war has progressed beyond 25% warscore.
I saw someone claim once that you can prevent all CTAs by getting 25% warscore on the first day of a war because they aren't sent until the next day. A fully blockaded OPM will be at -25% warscore. Never tried it myself.
I cant really follow everything,
i dont know how to start a Distraction-war
(because then I would have to fight Ottomans either)
but I will give you my situation:
I am Portugal, my enemy is Tlemcen, who only has 4 provinces left and 2 of them are coastal. They have 1 fort.
Can I do some Bullshit to prevent their Ottoman-Allies from helping them?
(behind Tlemcen sits Tunis which also allied Ottomans.)
((really annoying, because I already won a war against Tunis and made them delete the alliance with ottomans, but they made a new one..))