Now you have an alternative app for what you are wanting to to - Initial Ink Charge.
Also many sellers on sell the EAP for one printer model only. It's very hard to find the EAP app, look at Ebay, and look where the sellers are from so caution there. That site may still be legit, keep trying to contact them. 'battery powered chips'? That sounds interesting. Alas, the WIC program doesn't do initial ink charging for the p600 - as far as I can see. Thanks again for another helpful reply - it is appreciated.