Unless you do some tricks woth some sneaky subdomain 301’s and copy sites and adjust the last modified and a couple of other bits and bobs, there is nothing you can do to get out faster.
as said before, you can buy old domains which has had gambling content on it before.
Just, time, quality links, quality content and keep adding content……. this is all you need to do – which is what you should be doing anyways – so basically you do nothing to try and escape the sandbox.
my 2 main sites just came out (both same day to – 24th Nov). 1 was only 4 months old and the other 7 months (site targeting poker and casino) so im thankfull for that as some site can take at least 1 year.