There are many possibilities to approach the calculation. I'll be happy to see your table. If we have different points of view we can arrive to a realistic projection that we can post in the board profile.
I like your reference to the "Revenue Multiples by Sector (US)". I agree with a multiplier of 5 instead of 10.
It is clear that my table is not 100% realistic since it provides 100% of periodic renewals, but one thing can be compensated with another. That is, if you make the sales part much fatter, it compensates for the fact that you introduce a low percentage of recurring income.
A proper projection implies the development of a full business plan and market study which is out of the scope of this board.