You do NOT need to fork out 300$. What you need is an all metal hotend. The micro swiss one will work fine, not sure what those "creality experts" are on about(I'm pretty sure that's not an official Creality website btw). I have been printing polycarbonate nonstop for the past several weeks with the Micro Swiss NG which has an identical hot end design to the one mentioned in the article and it works very well. The "quick disconnect" feature makes maintenance quite easy as well. The build quality on micro swiss extruders is fabulous btw.

Printing nylon should be ok at 260C but if you want reach higher temperatures than that you will need to flash your firmware. (Btw you wont be able to print at exactly 260C since it will auto shut off the printer if it even goes 0.1C above that. I found that 255-257 was the maximum safe limit with stock firmware). Last I checked creality does not have an official high temp firmware upgrade for the e5+. I flashed a version of klipper that also has display support and run fluidd on a raspberry pi 3. I will post a link when I find the video I used.

You will need a sealed enclosure. This one from Creality works great and I get 50-55C build chamber temps with the build plate at 107C.

You will need build plate adhesive. I use magigoo PC and it works amazing, yes its expensive but I have never had a print come off the build plate or warp while using it with tuned settings. Here is one for nylon.

For your build plate I recommend just using a plain glass bed if you are using build plate adhesive. The untextured side of your stock glass build plate works as well.

Depending on how hot the inside of your enclosure gets you may need to move the control hardware (Box thing with the screen) outside your enclosure. If you are just printing nylon you should be ok since your build plate temp wont be going above 90C.

With nylon build plate temps this wont be a problem but if you even plan on printing PC any ABS parts on your extruder will need to by first printed out of PC or they will melt.