One more thing. you can provide your PCC application together with explanation that you did not receive your PPC yet, because of long waiting time.
With that you are able to upload your PCC later once you will get it (usin CSE)
But for the job reference it is a different story. You have to provide proof for all points you are claiming. Lack of that proof will end up in ITA rejection. And they will do that easily (they have more than enough applications).
So if what you are for from your employer is something you cannot substitute with other documents (eg. contract, payment slips, taxation documents....), then you have a problem.