The 18-year-old Aussie will have his second season at Premier League Glasgow when the new campaign opens in March but the One51 Aces have signed him as injury cover.
Grajczonek, who is rated highly in a group of highly-promising youngsters from Down Under, will face Belle Vue in a home-and-away inter-league opener to the new season.
The Aces will go to Glasgow on Sunday, March 22 (3pm) with the return at Kirkmanshulme Lane on Monday, March 30 (7.30pm).
Aces' finance director Gordon Pairman, who is also a promoter at Glasgow, said: "The fact that Belle Vue will be riding in Scotland has caused a lot of interest and Josh will be really keen to show what he can do."
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