Batch debugging: Step line-by-line

I am looking for a solution that will work under Windows 2000 and XP.
I can find a solution for NT4 and Win95/98 but they don't work any longer under 2k/xp

What am I searching?
*A tool, a parameter, another batch, a batch solution,.... to open another batch and process each line, waiting for a user action afterwards (for example enter or Y)
So he needs to execute the line, or the commands within, and then wait before going on with the next line.
Why? For debugging a very very large batch (following up registry execution and changes, timings,....)

What have I tried?
*the old command.com /c /Y trick which is no longer available
*%comspec% /c the same
*using a for loop to process the entire batch, putting a pause after each line and creating a new batch. But this doesn't work because he will try to fill in all the parameters and variables already, which is not good.
For example if a line in the batch includes %computername% it will be filled in when I use it in another for-loop to echo it into another batch.

Setting a pause manually between each line is not an option, the batch itself is over 15000 lines :)
So if anyone has a suggestion to paste each line litteraly (without changes, %variables% must not be filled in) into another batch and adding pause in between, would be already great. A parameter to start an command-line window with this possibility would even be better. And a tool is also good.

Anyone any suggestions?