I’m not going to “pasken” this one, just a few points…
Great tzaddikim did make deals with Hashem, the famous one about the Bardichever comes to mind.
Since I personally am very far (major understatement) from his Madreiga, personally I would not go so far.
What I would do in your place is simply add “Please Hashem I will (bl”n) do such and such for You, in return can You please grant me this and this.”
Less explicit than an outright deal like you implied, yet every time a Nisoyan comes up, say to yourself I promised Hashem to no longer watch ________ in exchange for _______, so I will be strong and not falter.
And every time it seems that Hashem isn’t living up to his side of the bargain, you say to Hashem, look, I am working so hard to abstain from watching ______ so please bless me with a life full of _______ so that I can continue to do Your Will.
I hope you get the idea and wishing you much Hatzlacha!