I don't understand why this would be a COI, I help with and consult other coins all the time.
At this early stage, I don't think that it would be wise to allow privileged access to an external developer, more so with the projects that are on the supernet scope. You might have the best of intentions, as well as you might not. As an early investor, I would consider such a level of transparency would be extremely naive and potentially damaging.
Voicing my opinion alone: Thank you, but no.
I have to agree with Myagui and Anti on this one. Major conflict of interest knowing your other projects. Sorry, but we just can't risk it.