I'm hoping that it isn't Holdsworth. Leave him to focus on his 'in-game' play without the added pressure/distraction of the kicking duties as he's key to our performances. Plus he was inconsistent when kicking earlier this season when Tickle was out injured.
Personally, I'd probably go with Westerman as he has the experience of being a regular kicker in SL, and if he's not on the pitch at the time then let Crooks kick.
All of that said, no matter who gets the gig we're still not going to have the same conversion rate that we currently have with Tickle. Tickle's one of the very best kickers in the league. There aren't many who can match or surpass him.