Change the default currency of the system, and the method of valuing inventory after there have alre

welcome everybody…
I hope you can advise me what I should do.
I work on the erpnext system, which is configured so that the system’s default currency is EGP and the inventory valuation method is: “FIFO”…
Now, after working on it, and migrating many operations to the items…
I urgently need to change the default system currency to “$$”, and change the inventory valuation method to Moving Average…

Is this possible in erpnext?