Hi NicNac, wow 6'7", getting up to my height!!!
If you're on the Northern Beaches i recommend you go and talk to Sam Parker at WindSurfnSnow. He got me going when i was deciding what sort of board i should get, he's also got a ton of demo boards to try.
Another option to potentially look at is a board carrier. I know that board can get a bit unwieldy (especially with a kid in tow) but some sort of sling or similar would allow a lot more freedom of movement. Something like this…:
www.oceanearthstore.com/stand-up-paddle-boards-sup-acc/sup-carry-strap/See you out on the water!