Hey!
That sounds awesome and super promising!
Regarding sharing I don't think there is anyway to share stuff under the MIDI Designer umbrella other than here, which is also fine I think, even though I don't know if others have had an ongoing development and debugging as part of this comment section though.. :)
Other options would be to start a Telegram/signal group or similar so you get feedback within the same forum a bit less in the limelight
Regarding design/layout MIDI Designer was never a looker, it really is the Duplo in a world of Lego. With this said, what I have noticed is when people work with consistent background colours but with clearly coloured knobs it's actually easier on the eye.
Some designs are extremely ambitious ofc, like this one:
https://mididesigner.com/qa/10120/layout-oxford-synthesiser-company-oscar-tauntek-mod which obviously involves some additional and pretty skilled graphics work, with which I for sure don't know how to make sure proper translation to various screen aspect ratios etc is kept in control, through app letter boxing?
But also this template
https://mididesigner.com/qa/8032/layout-roland-mks-80?show=8032#q8032 shows how simply a dark background with only one "menu" color/style and again clearly coloured knobs and sliders goes a long way to look "finished" and still provides plenty of contrast and direction, which also in a way mimics the original MPG-800, which the iPG-800 iPad app also took after
https://kengubler.ch/portfolio/ipg-800/
And this one shows that even without coloured background OR knobs, but just really clear grouping with proper space between controls, it's still super overviewable!
https://mididesigner.com/qa/7951/layout-elektron-sidstation
What goes for all of them is that they revert to a 2-dimensional version of knobs and slider rather than ones with shadows and stuff, which also makes them less clunky, it takes less effort to read and looks cleaner.
Somewhat off topic, but the Electra One which is maybe a bit more limited in visual configurability out of the box but would be a reference in terms of function and audience works very much along the same logic, black background to maximise the impact of the colours of the controls, which are then grouped according to the builder's parameter grouping logic - done.
Either way this template will be such a great contribution to the MKS-70/JX-10 family, providing a fully fledged framework that doesn't break the bank! It should be promoted on all the relevant JX channels so people know there is now a very appealing route into controlling the v4 JX-10.
Kepp up the amazing work man, whenever you have smth I'll for sure be ready to test drive!
