Hi!
THere is a way to use TWRP WITH OUT the NEED OF INSTALL IT!
Copy the TWRP image to ADB folder as if you gonna install it, suposing that TWRP is recovery.img file, on command type this:
It will boot on TWRP with OUT the need of installing it and you dont Will loose the stock recovery!
Im using it like this!
You can creat a .bat file (Windows) like this:
like this only need a double click! 
THere is a way to use TWRP WITH OUT the NEED OF INSTALL IT!
Copy the TWRP image to ADB folder as if you gonna install it, suposing that TWRP is recovery.img file, on command type this:
Code:
fastboot boot recovery.img
Im using it like this!
You can creat a .bat file (Windows) like this:
Code:
@echo off
fastboot boot recovery.img
pause
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