"with the pretext of" is correct and usable in written English.
You can use this phrase when you want to indicate that something is done under the guise of some excuse, even though the actual purpose might be different. For example, "He attended the party with the pretext of seeing old friends, but he was really there to meet potential clients."
"As long as you have uncontrolled armed groups with the pretext of liberating Lebanon, you will not have stability," said the Druse leader Walid Jumblatt.
The Western Australian treasurer, Liberal Mike Nahan, is eyeing electricity privatisation with the pretext of his own state's record debt and deficit.
The Salafis said the Alawites provoked them deliberately, to spark violence and find an excuse to get the Syrian army involved (with the pretext of entering north Lebanon to "control the situation", as the Syrian army had done during the civil war).
Once the street-cleaning Zamboni comes through, everyone moves his car back, but you have to stay in it until 10 00 — with the pretext of being able to move it if necessary, otherwise De Blasio's willing executioner will slap you with a hefty ticket.
Islamic movements, like the controversial Gülen Movement, have mobilized mainly through their networks in the education by opening hundreds of private schools, dorms, and study centers (dersane) with the pretext of quality education for the poor.
They are there with the pretext of protecting citizens from crime, but what they are most successful in doing is repressing any protest that might emerge.
In a translation of the video under the heading "Our message to the Western nation", it added: "We have warned you before about the consequences of these deeds that your governments collude with under the pretext of 'freedom of press' or 'freedom of ideas'.
I did not return to the beach with her under the pretext of getting the broiler ready for blackfish steaks.
America's attitude encouraged north-east African powers to perpetuate their strategy of destabilisation, giving them licence to settle accounts with Somalia under the pretext of combating terrorism.
Image the impact of that statement on an impressionable young man fleeing a region where people of different religion were murdering each other with abandon under the pretext of war.
In the meantime, Russia has continued to supply the regime with weapons under the pretext of "old contracts," while at the same time gathering near-unanimous international agreement over the slogan of there being "no military solution" in Syria.
