I'm sorry to say that the answer is no. I asked this exact question a while back and discovered that there's no way to do it without either:

1. Creating a full-blown module.
2. Messing with symbols in the included file.
3. Qualifying every included variable and subroutine with the package name.

I too wish there was an include() funtion that behaved as if you'd just pasted the included code on the same line as the include statement.