My supervisor, where I do part-time research (collaboration between my school and his institute), wants me to write a grant whose results will be known in about 8 months, while he clearly knows that I graduate in around two months. When we talked, he framed the project as essential for my future career and a key step toward my success, using overly simplistic reasoning that felt more appropriate for convincing a child than discussing career decisions. However, I was not persuaded by this framing, as I am clear about my own career plans.
I have previously told him that I would prefer to work with him given our common interests and some ideas we recently discussed. However, the situation has changed: I have not received any payment from his institute for three months due to internal documentation issues, and he completely ignored this when we discussed the project, despite my repeated follow-ups.
My PhD advisor is aware of both the stipend issue and my unwillingness to wait six months before knowing the results, and has tried to help resolve the situation. Despite this, during discussions, it was made to appear that the project must take full priority, leaving me uncertain about how my own priorities are being considered.
I want to refuse this project entirely, as I have secured a post-doc elsewhere, but I'm concerned about potential pushback since we have unfinished work and submitted manuscripts together. If I refuse to write this grant, it might negatively affect our ongoing collaborations. However, contributing without formal refusal could create expectations for future work even after I start my post-doc elsewhere. I've been patient with him on multiple issues, including the three months payment delay, but I can't wait anymore. I feel he's taking advantage of me. He can write the grant himself if he wants, but I don't want to be part of it. I'm uncertain, is it right to formally say I don't want to be part of it given our existing commitments, or should I follow a different approach?