I ask that you please do not send private messages to me directly on this forum as the private message function of this community site does not currently allow me to reply to messages. All questions and responses should be posted directly to this forum so they can be shared by all.
I really have no workaround at the moment for what you are trying to do except to create a local copy of your data in the subclass to use as host variables and then set these to the variables in the base class before and after the sql. Either that or create a separate data only class containing the shared variables and pass the data around using that object.
If you do not wish to change your current source code then I would suggest that we create a bug report for this so that we can add the functionality directly to the compiler.
Thanks.