Customise pricing plan

I have been searching around Wix Support and Googling for solutions on how to add the option to allow users to toggle between annual vs monthly pricing for each of the pricing tiers. There was no solution I could find for it up to now, could anyone please let me know if there is a walk around for this? Or else is this option totally not possible with Wix?
Secondly, I also need to know how we can make the last tier in the pricing plan as a custom quote, so that people would need to send us their details and we will get back to them via email with the best offer?

Any help is greatly appreciated