Hi Max,
Thanks for your feedback. You made me remember a couple of forgotten things and discover a few more.
It sounds like a great idea to have some of that germplasm included in a grex for imature moschata. I know I would like to try them out in my garden and taste them if you manage to collect seed. Keep us up to date on that grow out… I suspect we all love veggie photos 
.
Unfortunately, for this specific project that is particularly focused on extending the growing range further North, I fear it could compromise both the earliness and cold tolerance as well as the elongated shape. One of the many things Ken Ettlinger was already thinking ahead of us all… I wonder how many of the new varieties of the last couple of decades, are actually stabilizations of his populations… without the acknowledgement Ken and LISP deserve.
Anyway, paying it backwards… Ken, you are missed.
Regarding the Bush Butternut, I too included it in my initial butternut population. The idea of more manegeable and behaved plants was very appealing… but found it sub-par on a number of traits, for my particular ecotype and growing practices… I ended up converging on the same kind of approach @ThomasPicard mentions in this podcast… one big sprawling plant followed by two smaller upright plantas… a “two sisters” of sorts.
Have a great day
V