Here's how you do it in the meantime:
* Look at the monster from Pathfinder
* Use an equivalent monster from the 5e monster manual.
* Perfect match is irrelevant and a waste of your time
* The heavy use of massive stat blocks in 3.5/Pathfinder for NPC spellcasters and whatnot are the same: use the "Evil Mage" from the Beginner box and run with it from there. Need a tough fighter? Use a bugbear or hobgoblin stat block.
Traps are a bit more difficult b/c we dont' have much to work with.
IMO, wasting a lot of time attempting to convert something perfectly serves zero purpose. Grab a pencil and a post-it, and make quick reference notes to your DMG.
Skill checks should also be easy to convert. They're either a 5,10,15,or 20.
I completely intend to do this for the EGYPTIAN adventure path and will probably use the pathfinder adventure paths for my future play in 5e. They're simply better playtested and have more depth of play than "simpler" dungeon crawls.
Further thoughts?