You've seen crackhead's thread? If you can not locate that Bosh kit in Guatemala then have someone over-night it to you. It's pretty light. I would pressure wash the inside of the tank. By-pass the in-tank filter with a suitable jumper such as a piece of steel brake tube. Fit Wix 33323 externally to the rear abs line mount hole using the supplied clamp.
Time required to take r-r pump plate and clean tank is just a couple of hours if you have the parts. I have new in-box spares if you need them.
Use posi-lok red barrels inside tank if you don't have a soldering iron.
IMO there isn't a good substitution for the filter inside the tank. PP use one that is not rated for injection and doing so can lead to plugged injectors. The Wix is 10 micron and has plenty of spare capacity. You can also mount it to the rear, under the rear porter. The forward facing pump plate nipple is your pump output. That goes to the external filter then on to the black nylon fuel distributor inlet. Pump outlet pressure should be capable of 100 lph at 50 psi. The air box mounted regulator is pre- set to 43 1/2 psi. Lots of pumps can supply this but only a few mount well to the 11xx pump plate.
Jot down the do's, don'ts and common mistakes before you begin such as not busting off tank studs or using only submersible rated hose inside the tank and you will be fine.