Here's a list of the order of brake upgrades that I was advised when building my project car. Starts with the cheapest and easiest then gets more expensive.
1. Fit better brake pads
Obviously the cheapest. Only thing that changes is the pads.
2. Spacer kit, vented discs and better pads.
Some machining may be required depending on the discs you pick. There are plenty of threads on here discussing the issues that can arise from vented discs.
3. Volvo calipers, suitable discs and better pads.
Again, there are a few threads that detail what is involved with this conversion. I was advised this gives the best bang for you buck of any escort brake conversion. Will fit under most 13" alloy rims but be warned that chances are whatever rim you're running won't be on the list then you'll need to reach into the wallet.
4. Alcon or AP racing 4 pots.
Open wallet, remove contents. Needs 15" rims. Needs a bias pedal box. Can be imported from the UK as a kit or arranged locally when you contact the right people. Do it once, do it right. I like bright, shiny things so I picked this option for project car.
I've never seen a P76 hub/hz caliper conversion for an escort so i wouldn't have a clue what sort of brackets you'd need.