That is pretty well nail on head. There are a number of possibilities but none have a scorched earth trail or a simple clearcut wave that screams out the answer. That is why beaker has no consensus in the overall understanding of how it worked.
If there was one thing I think we can say about beaker is that it established an unexpected phenomenon of interlinking vast areas and apparently spreading and mixing genes from all over Europe together into a modern blend. So, as well as the metals, from a genetic point of view it was clearly also a marriage network of some sort. My best guess is that beakers travelled in small family groups and when they arrived in a destination they married their daughters or sisters to the local chiefs and in return married into their daughters etc.
That would create a system where a lot of mixing would happen. That way you could have families who have their beaker characteristics because they were originally beaker male lines and you could have families who have gotten beaker characteristics because they are locals who have married a beaker woman. If beaker and its exotica were sufficiently attractive then marrying a woman who could make the pots and perhaps the fancy clothes may have been an attractive prospect and indeed the only way of obtaining these things at a time when pots and clothes were home crafts and probably not bought and sold.
In fact, we probably need to remember that a market society, even for metalwork, probably didnt exist in the way we think today and all sorts of mechanism like tribute, dowries, marriage, fosterage, clientship, ritual deposition etc were involved in the distribution of metals so compared to a modern market economy there would have been a far greater need for a human element in the movement of high status goods, while home crafts like pottery, clothing etc also would likely have spread with actual women.
Even as late as Early Christian Ireland the evidence for actual markets is very slight and there are many legal records indicating that goods were distributed in elaborate obligation exchanges of annual tribute from under-kings, clientship, dowries etc. There was a system where gifts were given and other required tribute was returned. I think its called the book of rights. I will see if I can find a copy of it online.