On obtaining references from people who don't know me in person but have cited my work
Personally, I'd worry about this strategy for use for a permanent position. A bit less for another postdoc. Your papers speak for themselves without reinforcement by a letter writer except in, perhaps, exceptional cases.
I think the purpose of a letter of recommendation is to go beyond the product you produce and speak about your total fitness for a position. Someone who doesn't know you at all can hardly help you with that.
I'd guess that letters from postdoc PIs, for example, would be better, since you have worked with them.
Someone you know from conference contacts and who has used your work might also be (just) ok, since they can say something about you as a person. Even letters from someone like your old advisor who doesn't know your current work can fill in some blanks about what it would be like to work with you and how diligent you are in various necessary things.
Use the whole application to fill out a whole picture. If you overemphasize one part you will be neglecting other important parts.
If it were just your advisor and, say, two others who don't know you personally and haven't worked with you, then I'd really advise against it. One such letter might be ok if, for example, you've actually communicated with them in the past.