The 16MHz resonators I did ordered arrived. Thy do have the same footprint as the original 3,6864MHz resonators. In the picture you can see the new (top) and the old (bottom) resonator

With a hot air station it was easy to change the resonator. And the Atmega32L does run at 16MHz and supply voltage of only 2.8 Volts (this is according to the datasheet out of spec). 3.3V regulators are ordered, so I will l try them also.