Well you need to get a new orthos made, based upon details from various existing artwork. Go deep into the details and others that you trust give their opinions.
I suggest looking at the discussion of the Highlander and Flashman resculpts, this should give you an idea on how deep it will go.
I'm not actually sure the Orthos are required anymore. I think that was just how B3 worked. I think most of the current sculptors use 3D modeling software instead of physical sculpting. That would probably be up to the Sculptor if they need/want Orthos or not.
I think your next step is really to contact Speck, and see what IWM would be willing to accommodate. They have been in charge of the fan funding process so far, and I'm not sure how much additional work they can accommodate outside of that framework. I'm not saying the definitely wont, but you will need to coordinate anything you would like to try to do with Speck to make sure their availability matches up with your level of enthusiasm!
Just realize that, there is time involved in several different steps for a fan-funded mini: organizing all the funders, the initial design/feedback to get a model created, managing credits for funders, the QC process on the protoype model, getting time in the mold room for production, and then adding it to the catalog and packaging/storing it. At best, you could take care of organizing funding and getting an initial 3D model without having to ask IWM to commit time and effort. The rest of the steps IWM has to contribute time to make them happen. I'm not at all trying to discourage you. Just trying to set expectations.
If you do PM him on the board or email IWM, I would suggest presenting them with a plan rather than asking them what to do. It is likely more work if you say, "I want to get the Kingfisher resculpted, what do I need to do?", than if you tell them what you want to bring to the table (a prototype 3D model you/we had input on, and money), and what you are asking them for (QC it and release it as an official BT mini, I assume.) They are a business, and if you make them a good enough offer, I'd bet they will be interested.