what are you after, a full head colour or highlights?
alans right tint doesnt lift tint, and bleach as long as applied the right way and processed the right way should be absoultely fine, i always use bleach on my hair and every one comments on how shiny it is and the good condition it is in.
something like indola's super meche might be a highlighting option , it will lift with out so much of the harshness, it depends on what ur after as full head "bleach" blonde can be hard to pull off.
if your after a colour and not a bleach, u could always take a cutting of ur hair, making sure uv got all the diff stages i,e with and without colour on, and develope up the desired colour u were after, and see if it changes the hair that was previously coloured, that way ur'l know once and for all if thats an option