Hello @Troy Chaudoin . I would suggest you look into something like setting up a SharePoint VM and then install the 3rd party SigningHub product.
Info about Azure SharePoint VMs: https://azure.microsoft.com/en-us/pricing/details/virtual-machines/sharepoint/
Info about SigningHub: https://appsource.microsoft.com/en-us/product/office/WA104379739?tab=Overview
Please let us know if you have any questions or concerns after reading through the above documentation.