Is it possible to convert?

I know that the 700c is smaller and i need like 4mm for my brakes to adjust down to reach.... and yes i dont have that problem because atm my brakes are set up to the highest limit so i can definately move it done

Is it possible to switch the rear tire? My bike's a 10 speed so i know the width of the rear might be smaller?

Is there smaller hubs for 700c wheels? and since i originally have 5 gears on the rear, would that mean i would probably have to find a 700c wheel with the same size hub as my current wheel and just put on my 5 speed cassette on it? would that work? or is there maybe a possibility i can fit in more gears?

btw i'm not looking to bend my frame....

on a side note, i work at a bike shop so i can perform anything by myself

and please dont direct me to buy a new frame because i just want to know if theres a way i can just upgrade