I didn't realise that the idea Bell Beakers were an extension of Corded Ware culture and not of a Portuguese innovation is actually pretty old and predates the DNA evidence by a long way.The following was published in 1997:

“Like the Corded Ware vessels, these Bell Beakers were also typically placed in single male burials, often accompanied by weaponry and covered by a circular mound. They thus represent a diaspora of continental north-west European practices among largely alien populations, carrying the aggressive, individualizing ideology of this area to new parts of Europe. Whereas Corded Ware beakers were usually buried with stone battleaxes, Bell-Beakers are generally found with other weapons: daggers, and archery equipment such as triangular barbed-flint arrowheads and wrist guards of fine stone...This martial image was perhaps completed by leather jerkins and later by woven fabrics, held by a belt with an ornamental stone/bone ring to secure it...Early Bell-Beakers display the cords and thongs that distinguished their Corded Ware predecessors; perhaps the later zone ornament, too, is significant, for the Greek word zone means a belt, and the elite of Greek warriors are still evzones, 'the well-belted ones', while black belts still symbolize prowess in the martial arts. The imagery of third-millennium Europe was replete with such symbols, and Bell-Beaker graves expressed the warrior values appropriate to a more mobile and opportunistic way of life.”

Sherratt, A., ‘The Emergence of Elites: Earlier Bronze Age Europe, 2500-1300 BC," in Barry Cunlifee, ed„ The Oxford
Illustrated History of Prehistoric Europe, 250