Hi Aren,
The central line or port is a very helpful device in this regard, but the only concern is it's getting infected and clotted.
You have to take special care of it so that it may not get infected. I don't know what the weather is there in your location, but try to keep your child very cool. Sweating can infect the port if not properly kept clean. Furthermore it has to be flushed regularly lest any clots develop in it.
I hope you will be able to manage it as it can be a very useful device and prevent all the trauma of needle pricking to your child; however if it gets infected or clotted then that infection and clots can easily move to other organs via the blood stream and cause serious complications.
You will have to weigh it's benefits with the risks and decide accordingly.
As far as the chelation is concerned, then your doctor will advice you more better depending on the serum ferritin level of your child.
Take care, Peace!