Name and shame!
If They have pilots and are changing the aircraft training needs to be part of THEIR budget for doing this.
If they need additional pilots on an existing type and are absorbing you onto that fleet, their need dictates that they should have the budget for that as well.
The words pay and conditions are linked together for a reason, maybe I'm missing something but this seems to have all the regular hallmarks of a cowboy outfit.
My next stop would be legal advice.