I realize the big money seems to be in integrations with the larger CRM's. I would encourage you to look at Smart Suite which is a no code low code and I think will become gigantic in the near future. There are alot of companies (especially start ups that watch pennies closely) and would not pay for platforms like the Hubspots of the world out of the gate (when Smart Suite will automate to the same scale and degree for almost nothing in comparison). all of these companies will pay the money (or accounting and legal will force them too ) for document signing and tracking. Just something to keep in mind. These companies also tend to have a lot of Self starters so the traffic to your help desk I would guess would be minimal hopefully in regard to your return.