Maybe you are a small site of a multi-site company and everyone else is already using Wonderwhy?
Switching is no different to any SCADA switching project.
1. Identify everything the SCADA currently does (optional, you can just wing it)
2. Consult stakeholders on what bugbears with the current system identified in step 1 can be fixed/modified as part of the change. (optional, they can just get what they're given)
3. Estimate time/cost needed to do the conversion + cost of hardware/software. (optional, you can just have an open checkbook)
4. Present a business case for the expenditure. (optional, you can just use your business intuition)
5. Get funding for the software (required)
6. Get funding for the hardware (optional, you can just run it on the servers / desktops you were using before to run a less resource hungry application)
7. Get funding for the time to do the conversion (optional, you can just do it in your free time).
8. Do the conversion.
9. Retrain the operators. (optional, they can just learn by pressing buttons and seeing what it does)