BIG NO-NO I reckon,
Having worked on Croc farms on several occasions in the Kimberley(W.A), I'd suggest these animals are best left to those who are set-up to handle them and do so on a regular basis.(strict saftey procedures become second nature after a while). Perhaps the biggest difference between elapids, goannas, pitbulls and large salties is that the latter sees human beings as just another meal (pretty BIG difference) and you can't easily get to a hospital/ phone if you have a large croc hanging off your arm, most likely trying to drown you in the pond you so lovingly set up for him!! :shock: As for croc farms taking them when their older/bigger, they already have a ready supply of wild caught animals on their doorstep(rogues) so, unless you want to pay transport costs, I'd say it's highly unlikely.
Having said all that, there is a dwarf version of Freshie available to herpers in some states(adult length about 1 metre) that could be suitable.
Cheers,
Varanus.