i haven't installed such large packages .packages over 300 MB will be installed via smb share.
I only deploy a script which copys large file to local temp .. an the executes the large installation file.
I recommend to try not to fragment the package if possible .. (but i don't know)
But you can try is to just package a generic script which does nothing real to install something
Just executes a simple bacth script which just executes a dir command or something like that.
You should package the batch script together with a large file (iso image for example)
If that big package is downloaded and executed with a sucess .. than the size isn't a problem. But perhaps the execution time of your script.
You can create a logfile form your script to drive c to monitor what has happened
msiexec /i "installer.msi" /l*v "c:\log.log"
File.CMD > c:\log.txt 2>&1
where file.cmd is your batch script