DMX Control - 50W COB LED

Using an LED Strip DMX Controller and then boosting the (12V max) PWM output signal to 32V max.

No the DC-DC boost converter is for a constant input voltage, not pulsed.

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Taking a 12V power source, stepping it up to 32V via a variable boost converter. Then can dim the LED via a potentiometer connected to the 'voltage adjuster' on the boost converter.

LEDs are current driven. You need a constant current source with PWM dimming. Then you find a DMX512 with a PWM output. You need to understand that DMX dimmer modules can be constant voltage, constant current, or PWM signaling (typically 5V).

The LED you selected needs a constant current source. Many of the cheap DMX dimmers are made for use with 12V and 24V tape strips of LED that are powered with a constant voltage.

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Going full breadboard, building a controller from scratch.

You would need to learn a lot more before taking on a DMX project.

To give you an idea what you need to learn see this Lighting Kit from Infineon.

You need EIA-485 communications for the PHY layer, you need to implement the USITT DMX 512/1990 protocols if addressed to your dimmer, and pass through the DMX commands not addressed to your dimmer.

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There are multiple parts to dimming an LED with DMX if not using a complete off the shelf solution.

1. A constant current driver with a PWM dimmer input.

2. A DMX dimmer module with a 5V PWM signaling output.

3. A DMX controller.

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The Infineon Lighting Kit @ $120 is one of the least expensive solutions. Most professional DMX dimmer modules are over $200.

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If you can find a DMX dimmer that outputs a 5V PWM signal then use a $7 Mean Well LDD-1000H constant current driver with PWM dimmer input. You will also need a 36V DC power supply to power the LDD.

It is possible the 4 CH dimmer you linked to will provide a 5V PWM signal if powered with 5V.

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If you do not need to use the DMX protocols, and just want to dim the LED, use a $28 Mean Well HLG-40H-36B which can be dimmed with a resistance, a 0-10V level, or 10V PWM.

If you need a programmable potentiometer use a Digital Potentiometer

How about 4:

Use the PWM signal from the DMX controller to drive a dimmable LED driver?

Just make sure you have a pull-up resistor if your DMX controller is open-drain, and that the frequencies and voltage levels are compatible with your LED driver.

Product recommendations are off-topic here, but there are plenty of commercial constant current drivers with analog and PWM input for dimming.

Some comments with regards to your question...

1 - Your boost converter won't like being driven by a PWM signal.

2 - That doesn't make sense as it is not even a full solution, you just delegated the issue to another design step.

3 - Building something from scratch is a decent option.