By the “local tribes,” I presume you mean Bedouins. The aid that they give is on a mercenary basis, so beat the Jihadis’ price and you get their loyalty. Or, perhaps, they resent the Egyptian army because they get in their face more than the IDF used to do. That’s easy to remedy.
Egypt and Israel are allied for now, so if the Egyptians are scared of the dark, IDF can do the work then, or at least lend the Egyptians night goggles, if they don’t want us back in the Sinai.
The biggest benefit, however, is making Egypt responsible for Ghaza. They’ll simply drag out the Hamas leaders and shoot them, no legal niceties and no warnings, and that’ll be the end of the missile barrages on Sderot, Ashdod, Beer Sheva and occasionally further north.
Yes, Sinai is infested with Jihadis, so a few more from Ghaza and Judah and Samaria won’t matter much. Better to have them all together. Plus there’s hope that fishing and resort hotels will catch on, as well as transforming the desert into a garden, just to prove that they can do whatever the Jooos! did. We’ll help them prove it.
Egypt is broke as I read, so were does the money come from to bribe the tribes?
I think it isn’t a matter of Egyptian army troops assigned to the Sinai region being scared of the dark, so much as it is a habit and likely reinforced by their low pay and poor training. Night vision goggles would just end up being worn by the jihadis. Egypt would never allow the IDF to operate openly in the Sinai, barring some high-level treaty which likely could put more adverse political pressure on el Sisi.
All Egypt’s front line troops are tied up elsewhere - many along the Libyan border. I doubt el Sisis would order a shift as trouble in the Sinai does not yet pose an existential threat.
Then there would be the question of Palestinian access to Egypt - something no one wants, but could not entirely prevent given their Sinai state. How long would it take for them to begin working with the MB to overthrow el Sisi? Not long.