[brc]

The issue is already the amount of regulations that attach to a full time worker. Adding more will only generate adverse affects.

Using words like 'forcing' and 'penalising' will work in the opposite direction to what you might hope.

You already identify the issue - full time workers require benefits and the like. For many small organisations, these make the cost of a full time worker prohibitive, so they fill in with multiple part time instead. The employer is incentivised to keep people part time.