OK,now I understand a little more what you want to do. As far as I can see, you don’t need MIDI SysEx messages at all. All the Elektron instruments allow you to select the next pattern by sending a MIDI Program Change message with a value that matches the pattern that you want to switch to (value 0 = pattern A01, value 1 = pattern A02 etc).
I looked at the User’s Guide for the Soleman and saw that its Scene Mode steps through its own programs in sequential order and that you can use the Soleman’s “Previous” and “Next” footswitches to change scenes incrementally/decrementally. If you use the default Soleman behaviour to send MIDI Program messages, the Elektron gear can be configured to change pattern in exactly the way that I believe you want. All this is based just on reading page 8 of the Soleman menu. There is no need to use SysEx messages.
If you want to get fancier, you could use the Soleman’s List Mode to customize the order in which the Elektron instruments’ patterns are stepped through, or use MIDI notes from the Soleman to trigger patterns according to the MD’s Map or the MM’s Multi Map configuration, or both. But maybe that’s best ignored until you have achieved your initial goal, which should be rather easy.
In fact, the Soleman looks like a rather nifty piece of MIDI gear, and I will be investigating it further thanks to you.
Just for completeness, “Start” and “Stop” are generic MIDI messages and therefore there would be no need for them in a SysEx implementation. SysEx (System Exclusive) messages can be optionally specified by the manufacturer of an instrument on top of the generic MIDI vocabulary, and so would not be given in the basic MIDI specification anyway.