I would ask that Waldo do the opposite. That's insane what you are suggesting, any refund request will be gladly accepted by HashFast, but they are the ones who dictate the amount of BTC they will send back to us. How are you going to make them pay the full amount? Who is going to pay for the lawyers?
If they send back less than the full refund, we drag them to court, or we accept the arbitration clause of their contract and go into arbitration. In any event, anyone happy to receive a small portion of their original BTC back can then bow out and sign away any rights to the outstanding BTC refund amounts to the other members of the group buy who wish to push forward, and who will ante up whatever is required to hire a lawyer.
If we do what you are suggesting (customized refund request) we are fucked! They will send partial refund and scratch us of the customers list, resell our miners to somebody else, this time without the obligation to send the MPP.
Do you really think you stand to make more mining, considering we're a good 30 days away from delivery at best, than you would in even a partial refund? Keep in mind, there is every chance that the MPP will be delivered in the same "too little too late" fashion that the miners we've already paid for seem to be coming in. And no, we would not be fucked doing what I suggested, even if they send a partial refund and scratch us off the list. We still have all kinds of legal options available to us to get the full BTC refund we're entitled to.
HashFast wants us to do what you are suggesting, and with our custom refund request we give them the document that we officially requested the refund. Are we that stupid?
We give them documentation that we requested a refund, and a refund that they didn't provide (assuming they don't pay back the full amount of BTC). The only "stupid" option is to return their premade heavily one sided refund request form that signs away all of our rights and will only ever get us back a small portion of the BTC we originally paid. But sure, insult away.