Budget friendly way to control dimmable house lights

I am currently compiling together a lighting system for my church and was wondering what the best, budget friendly options are available to control house lights from the lighting control desk.

 

Here are some guidelines that need to be addressed:
1. Must have architectural wall panel control (for custodians, etc who need to get in to the place when a console operator is not there)

2. Must be able to control the lights from the lighting control desk.

3. Must be budget conscious and effective. 

Our lighting control desk is a Element 40 250 Channel.


I'm not sure about these ideas but here is what i'm thinking;

Getting a DMXKing eDMX4 Pro to combine the console and archetectual wall panel together. (link is here:https://dmxking.com/artnetsacn/edmx4-pro) I would be open to a ETC equivalent of the product. This would be a HTP (Highest takes precedence) setup??

 

Looking forward to responses. 

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