Can give an update how my procedure was: Sent in the documents 3 weeks ahead of my 7 year date, included e-tax documents from all years I had, scans of all working VISAs plus landing paper and my two employment contracts. Got a note 3 weeks after my 7 year date from setting a physical foot in HK that I could go to Wan Chai for further processing.
Went to Wan Chai, only westerner sitting in a hall full of Chinese/Asians just when I was called, one other white guy came in, we gave each other a nod and then I went for processing. They didn't want any further documents at all One small mistake on the form I put the date of my application and they wanted the date of 7 years (it was worded a bit strangely). Did the classical HK correction of signing a page and then all good. I asked if they could give me a time straight away for issuing the new PR card. She looked at me as I asked something very stupid and just said, if you want it quick go to Kwun Tong today. I didn't but I did book a time for the coming Saturday (center had just opened 2 days prior).
Went to Kwun Tong temporary center next Saturday. Got a total noob who had no idea how to even input my information. Got a bit frustrated but realized I had an opportunity for a mini-coup of being allowed to show teeth (smiling) on the photo after a very slow registration process. Showed my full set of teeth without complaint (this did not work 3 years ago when we got the new type of ID cards). Another office took my old HK id and gave a paper which was my temp ID card until the new one was printed. Asked if I could pick up the new card in Wan Chai, again got that look. No can do, have to pick up in Kwun Tong. I picked it up 2 weeks later on a Saturday, shook the old mans hand who gave me the card and was very happy!