your talking a few grams in wieght change it wont move th balance that far forward or backwards when you replace it with something that is 75% of the weight that was on it before the change. Lets assume the steel collar wieghs
1ounce or 31 grams - 75% equals roughly 7 grams just slide 7 grams up and down to how far it will take to move the balance point. There is a formula to do this and a cant think of it or find it but anyone flying planes know it for wieght distribution so they can maintain a level or balanced flight so to speak.You can also install a longer pin to offset the weight change if needed.
I think switching to Ivory will premote a better hitting cue if done right.
Hit with some ivory jointed cues first or ask the cue maker to make you a sneaky with an Ivory joint so you can try it out first.
Just throwing out more then 2 cents worth.
Craig