Well, someone helped me get partway there: you cable the Transform Op. fader to the Transformer, not in-line. Also, it's Meta Event 127 I wanted. And getting the range right is a problem I'm still trying to work out.
You are on the right way regarding the M127. Right now I'm away of Logic so I will try to work offline...
As you have noted some Transformer settings like "Mul" use high byte settings which top range is 10000. In the same time you are trying to use a regular fader object which is non-14 bit one using range 0-127.
In this scenario you can control the "Mul" 2nd byte condition between 0 and 1.0000 if I'm not wrong (I'm offline Logic).
Here is a little workaround:
1.Create a bunch of Transformers using high value settings that can not be controlled via M127. Label each one as say 2.0000, 3.5000, 4.0000 etc.
2. Create one more transformer and label it as "Fine Settings". This one can be used as M127 fine control later!
3. You need to develop a Condition Mapper Transformer which will control that "Transformer Ensemble". Here you must define the incoming CC ranges and program their "Range message demix" so each range have to be physically demixed (cabled) to the target transformer in the Ensemble. Here you can use dummy re-channelizing operations(inc Channel Splitter), condition splitter thru tob-cable methods etc.
Hope you see the idea ?
P.S Hey CSeye my environment Gloria can not override the Logic environment limitations sometimes !