Hi Again,
We are starting development of the FormsViewer Designer in Q1 and hope to have a prototype integrated into the FormsViewer app by end of Q2. It should become available to you without any installation if you are using FormsViewer online (O365), Our major focus for the first release will be the *edit* scenario. If you have an XSN, in addition to supporting view layout changes, FormsViewer Designer will support editing and adding fields, rules, and data connections. The initial beta release will probably not support creation of new forms from scratch. I.e., you'll have to start from an existing one.
Publishing to FormsViewer is much simpler than publishing to SharePoint - just save the XSN and drag and drop to your FormsViewer page.
FormsViewer Designer has been on our "back burner" up until now because Microsoft extended support for InfoPath Designer 2013 through the end of 2025, but we plan to start development soon.
Please let me know if you'd like to be on our Q1 early adopters list.
Thank you for your interest!
Patrick