Yes, yes at last Realviz Stitcher can handle fisheye lens.
The following is my workflow without the DeFishing stage, which double the file storage requirements and reduced workflow rate.
Equipment: Canon 5D, Canon 15mm f2.8 Fisheye lens, customized 360precision panohead, Manfrotto 055Pro tripod plus 555B central column, and Canon TC-80N3 Remote controller.
Camera Setting. Manual Focus at hyperfocal distance, same Manual exposure for all shots, Manual white balance locked to gray card for environment lightning. I don’t often bother with RAW so large JPEG files.
Realviz Stitcher Workflow
1. Load images. Straight from camera at last.............
2. Stitcher will try to identify the lens, it gets it wrong as being a 15mm rectilinear lens, we will change this in a second.
3. Select all, and rotate the images 90 CCW.
4. Select Edit, Properties, switch to Full Frame Fisheye and press on calibrate fisheye lens and accept setting.