The 28-year-old powered in a header from a corner to equalise with just six minutes left - but there was still time for Norwich to grab a first win in 10 Barclays Premier League games as Grant Holt scored at the far post deep into stoppage time.
"Kei is a different type of player to whom we have up front and we are delighted for him," said Hughton, who had started with both Holt and January signing Luciano Becchio in attack.
"He had been here to England before (on trial at Stoke), but these things are all about timings and it was right for us.
"He has that ability to get beyond and is good in the air, he gives us good possibilities.
"It is always a bit of a risk because you are bringing players over who you don't know how they will settle into the league, but he is a lad who wants to do really well and it is a good opportunity for him."