Is There Any Way To Convert From MCRegion To Anvil On A Server Itself? Without Having To Download The Files To My Computer And Run Them Through A Converter? Also If I Set Anvil As The World Format To A MCRegion World Will The New Chunks That Will Be Generated Be In The Anvil Format?
It is not currently supported. When it is, it will be here: https://github.com/pmmp/PocketMine-MP/blob/master/src/pocketmine/resources/pocketmine.yml#L108L117