I think it might be worth trying but IMO a 2-3 'flat' is going to be different than the 15lb packer. You see guys on here from time to time with these little ones and they have troubles.
It'd be worth trying. The beauty of them only being 3lb is you're not out much money . . . ;)
18.5" WSM ; 22" Kettle ; Weber E-330 ; Weber Q200 (for tailgating)