I've never heard of a site failing due to a Practitioner being labeled "incompetent."
Have you read the guidance documentation on the requirement? If not, here is the link: http://www.sqfi.com/...ce-Document.pdf
Also, from the SQFI website http://www.sqfi.com/...f/faq/sqf-code/
As noted, there are no specific requirements for training (other than HACCP) or testing. The practitioner must demonstrate knowledge of the current version of the SQF Code. Some choose to do this by either successfully completing an Implementing SQF Systems training course, or by successfully completing an Implementing SQF Systems examination. Additionally, the practitioner may adequately demonstrate knowledge of the Code by having an effectively-implemented SQF System or appropriately address questions posed by the auditor at the time of the certification audit.
Additionally, note that there is no requirement to register or “certify” as a practitioner. A person in the role of a practitioner must meet the requirements of 184.108.40.206 and 220.127.116.11 of the SQF Code. Therefore there is no need to “re-register” or “recertify,” nor is there a need to retake either the Implementing SQF Systems course or the Implementing SQF System examination if already successfully completed.
In my opinion, I would say a HACCP course completion certificate would help prove part iv. For part v, if you are truly worried about it, I'd suggest having them attend an SQF Systems training course, if at all possible. I have taken a few training courses and found them extremely helpful in understanding the code. It would also help to have them read the implementation guides for the modules their facility falls under. The implementation guides are very good at helping interpret the SQF code and how to conform to its standards.
One thing I did when I started was make a spreadsheet listing each clause of the SQF code (modules 2& 13 for food packaging). Then I had a column listing what policies/procedures/work instructions we had in place associated with that clause. I added another column for associated paperwork/check sheets/product tracking system information. It really helped me understand the code, as I knew what to look for as "evidence" to prove that we conform to the code. I'll admit it was easier for me, since we were already SQF certified when I started, but it still may be helpful for your practitioners.
I hope this helps!