Math is your friend. This is a case where a reading will probably not tell you what you need to know.
A 1.054 OG for a 5 gallon batch means 54 x 5 = 270 gravity points (GPs). To that, add the contribution of the sugar: 44 points per pound x .75 pounds = 33 GPs.
270 + 33 = 303; 303 / 5 = 60.6 (call it 61). So when calculating your ABV, consider the OG to have been 1.061 (since that's how much sugar ended up in the wort) and go from there.
Now, if you had mixed the sugar in say a quart of water, you would divide the 303 GPs by 5.25 (gallons) instead of 5.
"Anything worth doing, is worth doing slowly." ~~ Mae West