Sounds like a good plan.  
BH has bucket-reared calves all his life - he reckons to get them at no less than a month old, give each calf one sack of milk replacer, which tends to work out at they get weaned around three months.  
We now have a Jersey house cow and she rears bought-in calves as well as supplying the house.  Again, I have found that it's best to keep them on milk (plus hay / straw and cake to appetite) to three months or so.  We have also found that we've been able to buy them in a little younger - two weeks old - if they are going onto milk from the cow, rather than the powdered stuff.
Let us know how you get on!