seems the peace treaty is a dead letter already...
Isreal simply needs to highlight the document and declare to egypt to 'move em or lose em' and act accordingly...
Doing that requires Israel going to the United Nations and having the various permanent and rotating members of the Security Council discuss, propose, investigate, report, proclaim, denounce, etc. in what amounts to the diplomatic equivalent of "Rope-a-Dope." In the meantime, the Egyptians would continue to move prohibited military arms and personnel into the Sinai...
Better to warn once now, immediately act decisively if the provocation/violation continues, and explain in the UN afterwards.
If they go this route, I just hope they will not talk themselves into taking half measures expecting to get some credit for showing restraint. Second only to a nuclear-armed Iran, the Egyptian Army - especially one that feels itself no longer constrained by the peace treaty - is an immediate existential threat to Israel. Israel should treat it accordingly.