"Can Webster even work out of the country with pending legal action?"
In terms of travelling to Australia - Given one of the original bail conditions was as strict that he couldn't drink at all and that he couldn't enter a licensed premise (before variation); I would think a bail condition against overseas travel would likely be imposed. I am not sure Australia would accept him at the border anyway.
In terms of working in Australia - under the Trans-Tasman Travel Arrangement, NZers can work in Australia under the Special Category Visa (Aus), however people with criminal records are usually barred from holding a SCV.
I think Immigration in Australia likely have wide powers around behaviour and character requirements too; likely they would withhold an SCV in the circumstances I would think.
I personally don't think any team should go near him currently given the complexities.
It is worth mentioning that the charge of assault with intent to injure is quite serious; Webster can, AFAIK, elect trial by jury if he pleads NG (though he might not do that in the North Shore given the demographic); it carries a maximum imprisonment term of 3 years (though NZ courts are notoriously easy on sentencing). Though I understand he has not being proven guilty in a Court of Law, I am surprised Wellington didn't tear up his contract (Especially given the fact the Saints owner owns many bars around Wellington).
*my thoughts and opinions only