The eight-year-old survived a bad blunder at the second-last before coming back quickly on the bridle and powering up the hill to win impressively.
William's Wishes is entered in the Victor Chandler Chase at Ascot on January 19, but Williams is more likely to send him over here a day later.
"I'm looking at the Dan Moore Memorial Chase at Fairyhouse on January 20 next," said the Llancarfan handler. "On Saturday's evidence he's still some way short of top class.
"I couldn't pretend to know where I am with him because he shows so little at home."
Alasi may take in Doncaster
Alasi could either head to Doncaster for a Grade Two she won last season or go straight to the Cheltenham Festival after her fine second behind Une Artiste at Sandown on Saturday.
It was the second time this season Paul Webber's mare had chased home Nicky Henderson's Fred Winter winner after the two filled the same places in a similar race at Wetherby in November.
The OLBG.com Doncaster Mares' Hurdle on January 26 is once again a possible for Alasi if the ground dries up, but Webber would not be afraid to send her straight to Cheltenham.
Alasi has finished fourth behind Quevega in the last two runnings of the OLBG Mares' Hurdle at the Festival. "She's come out of it bouncing," said Banbury-based Webber. "We know she's not as effective on heavy ground.
"If it's going to be decent ground anywhere in three weeks it's likely to be at Doncaster."