Wow, go away for a couple of days and golly gee.
Thank you everyone for your very kind and informative responses, the general note we are getting is that propagating for this size wash might be a little ambitious. I will say i am surprised that on mast distilling forums propagation of yeast does not seem to be as common as it does on brewing forums, i think we might play around with this and share our notes at the end.
This video here is what started us thinking about it and experimented with a Whitelabs liquid yeast (not sure is dry yeast would be treated the same)
Take a look guys see what you think
https://www.youtube.com/watch?v=VnlGrlJ3PvE&t=1033s