Okay I really like the idea. I think the bottom line whether the SaaS is worth the cost with the premise is that the SaaS saves time. However, time saving (item 4) is pretty difficult to gauge. Therefore, I suggest having a version where time saving is the output.
So then the question become, I have to believe that this SaaS will save XXXmin per employee for me to consider buying it.
So then the question become, I have to believe that this SaaS will save XXXmin per employee for me to consider buying it.