I have been doing similar research. From what I can tell, injectors and fuel pumps are still available. Warm-up regulators are starting to get scarce but still available (and there are some upgrades out there). Fuel distributors may be rebuilt by various shops. I have found one source for new lines:
J2 Precision Hose*::*'CIS" Fuel Lines*::*" CIS ' CONTINUOUS INJECTION SYSTEM REPLACEMENT FUEL LINES
I intend to keep the CIS as I rebuild my 75 Targa, primarily because I do have experience with the system (older Audi's) and have to get the car smog-checked where I live (so need "stock" induction).
As far as whether or not it's the simplest - I guess that depends on how complicated you find it to refit something else.