Hi Alex
You can mount a baffle plate on two posts which can be screw into the focusser board and removed for transport or something similar
Here is Mel Bartels online baffle calculator.
http://www.bbastrodesigns.com/baffle.html
( Edit : this calculator seems to assume a baffle behind the diagonal mirror too
)
Come to think about it , a single baffle could only be used to fully baffle the centre of the field at the expense of causing vignetting at the outer edges.
A rear baffle can be made of very thin aluminum and needn't add much weight .
I agree that for sake of portability end user must decide what is important for them . The more effectively it can be baffled the wider the market though .
Watching your project with interest.