Bellamy had to watch from the stands in Vaduz because he was suspended after receiving a second yellow card of the campaign for dissent during last month’s defeat by Belgium, meaning assistant boss Piet Cremers led the team in his absence.
Regardless of any disruption to their preparations, however, Wales were expected to make light work of such weak opponents.
There are only four countries in the world ranked lower than Liechtenstein, and their largely part-time team – featuring students and office workers – had failed to score a single goal in their previous six games of this campaign, conceding 23.
They had at least proven their ability to frustrate during the reverse fixture with Wales, holding out until the 40th minute in Cardiff before conceding the first goal and eventually succumbing to a 3-0 defeat.
In Vaduz, their resistance lasted even longer.
Broadhead thought he had broken it after 25 minutes, slamming in after Liechtenstein had made a mess of clearing a Wales corner but, after being sent to the screen by VAR Angelos Evangelou, referee Juxhin Xhaja disallowed the goal as Welsh players had impeded Buchel from an offside position.
Buchel had already made saves from Broadhead and Jordan James but it was a measure of how poor Wales were that Liechtenstein rarely looked panicked or overwhelmed.
The visitors were marginally better in the second half yet, for all their possession, Wales created precious few clear chances.
The goal was the standout moment of quality, Williams threading a delightful through ball to Daniel James, whose inviting low cross was slammed in by his namesake Jordan.
He took the shine off his first international goal by getting booked two minutes later. With Ampadu also getting cautioned in the second half, both midfielders will be suspended for Tuesday’s match against North Macedonia.
Liechtenstein even threatened to score in stoppage time, but Wales were spared that embarrassment as Sandro Wolfinger volleyed wide.