The number of Walmart workers on some form of government assistance is significant.

Significant enough that Walmart couldn't operate without them. Not to mention, Walmart manages to capture those government dollars through accepting EBT and such.

And the goal is to make WalMart pay regardless of how they try to weasel out. If you say "only full time", then they employ thrice as many people and give no one enough hours to make a living. Same if you prorate to hours worked.

Essentially you need to stop inventing rules and systems that can be gamed. Because Walmart is incentivized to game them. Push them in the direction of hiring people full time and paying them a fair wage for their time.