It was possible not to use hydrochloric acid as a catalyst. Gold nanoparticles play a catalytic role. Watch
Article Preparation of Gold Nanoparticles from the Metal Scrap
The hydrolysis reaction is always reversible. It does not happen to the end. In order to obtain a composite without HCl, it is necessary to heat it in vacuum. Then you will remove the HCl.
To simplify your experiment's steps have you tried to electrogenerate polypyrrole? Numerous methods for electropolymerisation are known in electrochemistry. Among them : cyclic voltammetry (CV), chronoamperometry (CA), chronopotentiometry (CP) ...etc
These techniques usually needs an electrolyte (LiClO4 in acetonitrile for example) and you should not have to include additional steps to your synthesis.