Consumer camcorders produce very acceptable video these days but don’t give you much if any audio control. Prosumer camcorders run around a thousand dollars or more (new) and even they don’t have all the audio controls or features of a dedicated portable digital recorder (PDR). Professional video cams cost thousands and do have a lot of the options. Trust me, if you have video editing software on a computer like Adobe Premiere (which I believe you have), it’s easy to sync the files up. You have the ability to line up visually the audio waveform of the portable file with the audio from the video camera and once it’s lined up you turn off the video camera audio clip. I think Ivana knows how to do this.
Alternatively, you can always look into renting higher end equipment and then hopefully you’ll get advice on equipment features…Those cameras can be daunting to use especially if you don’t film all day every day….I’d say to buy or continue borrowing the consumer camcorder and sync the audio from the recorder. Maybe borrow the camera again and see if you can rent the PDR and try it out with the lapel mic?