Hi,
I have a MiniPac (
https://www.ultimarc.com/images/Minipac_wiring.pdf) and 9 buttons : 5 blue led ones, 4 red led ones (5 volts leds).
I would like to know if it is possible to wire all that together on a MiniPac, and if so, how to do it please ?
Here is the MiniPac. I used the wires of GROUP J4, 1 RIGHT and 1 LEFT here, to connect them to my Blue button and Red button (respectively).


If I connect the MiniPac right now, the buttons should work, but not the leds.
To connect the leds, I have this IDE Flat Data Cable which I can plug to the MiniPac on one end, and cut on the other hand to fix the insulated spade/connectors that I would connect to the buttons for the leds.

As the MiniPac has 3 "GROUND" and 3 "5VOLTS" wires, I would like to know if it would be possible to have 9 leds buttons (they are one color leds), thus 3 per wire. If so, how could I connect that ?
Can I follow that (for the leds : + on "5volts" and - on "GROUND"):

and that (for the switch, as I already did):

and have no electric risks?
Once done (if that is possible), would I be able to also connect other switches ? If so, how many (if there is a limit other that what the MiniPac offers, i.e. usb limitation).
Thank you for your help !
day