The conversion kit around here is $100 and then add the carbide 3 dies set. Decapper, bullet seater, carbide resizer(Dillon $60+, Lee $38 , Lee Carbide Factory crimp die. $19) . I would also buy a toolhead so you don't have to reset your own 40 cal dies when you switch back. $28 for the tool head.
So probably switch over for $200. Using your powder measure and powder check.