Look, I gave you already credit for your idea here:
Maybe someone organize a passthrough (groupbuy) on Havelock to get that 5% extra? Of course with some fee like 0,5%, it's daily job after all to transfer from one account to another.
Done. Alas, 0.5% won't be worth the hassle.
GREAT, but 2% of a fee is too much. I suggest 1TH fee, more interest you get more for your customers and thus more chance to success. And maybe some reinvestment option? Those 3% extra (I suggest more) reinvest to buy more AMHASH1 shares. This way you will be able to pay more and more (compared to AMHASH1) to "investors" thru time.
Short story, if you do that I'm all in. That's something around 0.05 BTC

What you describe (with the reinvestment option) is more a pass-through operation than a group buy. This is meant to be a pooled IPO order, i.e. the deal is over once the shares moved into the buyers' Havelock accounts.
As for the fee: I did similar group-buys last year and know how hard-earned the money is. I believe at 2% there is a slim chance to cover external fees and trouble, below that is charity. If you believe it is doable for less, I would gladly hand the thread over to you. What do you think?