Williamson is one of nine drivers engaged in the
1200m Dash For Cash tonight. The series - originally pitched to be two nine-horse heats and a final on the same night - drew just 11 nominations.
An $8000 race is being held instead, with nine starters and two emergencies.
Alexy will start from barrier 5 after the emergencies come out, and Williamson might watch the carnage unfold in front of him.
''I'll probably be going back with my type of horse but I'd say they'll be going like stink early,'' he said.
''They might back it off going around that first bend and more or less flat out from there.
''There should be a three-wide train the whole way - it might be even wider.
''It'll make for exciting racing anyway. It's good that they're doing something different.''
Alexy's sole success on race day came at Forbury Park in August 2012, but Williamson feels the draw could be the telling factor for the Bruce Negus-trained gelding.
''It likes Forbury and has had most of its luck at Forbury - it's no stranger to the track - but it's a pretty even field.
"He'd probably be lucky if he's getting money with the outside barrier draw and the distance.''
Williamson has two other drives for Negus on the night, pairing up with Merilane after her long-odds win at Oamaru last week and Quick As I Can, a winner at Gore on December 3.
Williamson has a bit of time for Quick As I Can from his second-line draw.
''I think he's a pretty good chance in that race. If he gets a good suck on through, he's a winning chance.
''He won so well the other day and he had a wee gallop which added to the task but he was still good enough to come home in 28.2 [seconds for the last 400m].
''He's good enough to win ... He'll probably be favourite.''
Tango Lady (race 5) is a beneficiary of the drop-back system, and is having her second start back in the c1 grade after battling as a two-win mare in the last 12 months, even if she has to take on the talented Mossdale Conner tonight.
''She's got the good draw and the stand. She's won the 2700m c1 race there before.
''She needed a bit of a blowout last start. She should be a place chance - third and fourth is probably about her best.''
Williamson's older brother, Nathan, has the former pacer, Eddie Boy, making his debut as a trotter tonight in the c0 2200m trot.
Nathan Williamson said the son of Elsu had taken to trotting with relative ease, after former trainer Graeme Anderson spotted the 6yr-old's capabilities in the square gait.
''Whenever he was in the cart or working down the beach, Graeme thought he had an inkling he could trot,'' he said.
''He's picked it up pretty good for a converted pacer, especially one who could make a mistake or two at the time.
''He seems to quite enjoy it. I'm taking him to Forbury for a race-day experience.''
