As you say, that scenario if for an accomplished, a.k.a. "professional" meditator. In the version I was taught (for non-meditators) you've got to have time to do the practice just before death.
Garchen Rinpoche said in his last teachings that it is enough that you can recall Amitabha, no visualization or recitation is required if you have made the pathway clear and have achieved accomplishment in the practice.[/quote]
Which version was he talking about? Was it the extremely advanced and secret 6 Yogas of Naropa version, or the version for non-meditators?