I would wager with the dollar the way it is you’re better off trying to get one from the current stock Cheeky Monkey have, or make your own out of aluminium angle section (sometime soon hey?)
Let’s see, 45x16 = 73.9 inches. A 17 would take it down to 69.6 in. I get around on a 42x16 = 69.0 and I’m not too flash on hills - a real struggle up Duttonberg on that gear, but otherwise it works well for Brisbane. Not only do you have to go up some grunting hills, but you have to spin down them too, so you don’t want the gear too short.
I wouldnt say I have “monster legs” but they’re not small either… I used to ride a 39x16, and that was too easy up the hills, and too hard down the hills, It took so much to control my leg speed. Duttonberg? Is that in Brissie?