Weapon and commander coding colours for Bolt Action infantry stands

I saw a Bolt Action tutorial series on YouTube (that I now cannot find because there are SO MANY now that I've watched) that had painted the edge of the infantry bases different colours for each type of solider- Squad leader, squad heavy weapon, basic grunt.

I think this is an amazing idea considering all the infantry is painted very much the same and deliberately so.

There does not seem to be any historical or current practice of a colour for each type of unit that I can find. I'm thinking of a different one for Platoon Commander, Squad commander, SMG, LMG, Light Mortar, Sniper, Anti-Tank weapon, because these are the hardest to tell apart. Larger weapons are are a lot easier to see and tell apart.

I don't think I'd want to paint the entire edge like the video did, but just a stripe or stripes of multiple colours on the back edge of the base plate as I'm the one who will care about it the most. The rest of the plate should match the terrain the army is based on (green for Europe, dark green for Pacific, pale yellow/brown for Africa, and white for the Eastern Front)

I know British Armour for example would have different colours for platoons or companies, but this is just for infantry.

Using video game rarity, which is the style these days for everything:

White: The most common rarity color

Grey: A low value color

Green: A middling value color

Blue: A middling value color

Purple: A high value color

Legendary rarity colors 

Orange: The highest value color

Colour Coding stripes on the back of each infantry's base:

Base Colour: Rifle

Grey: SMG

Grey and White: Assault Rifle

Grey and Blue: Automatic Rifle

Blue: LMG

Purple: Mortar 

Purple and White: Grenade Launcher

Light Green: Anti-Tank

Brown: Sniper

Red: Flamethrower

Orange: Artillery Spotter

Yellow: Air Spotter

Red and White: Medic

Black: Assistant

Weapon Colour and Black: Weapon team assistant

Bronze: Squad Commander 

Silver: Platoon Commander

Gold: Company Commander

Looks like I'll need to buy some Army Painter Speedpaint Metallic's now, along with purple, blue, light green, red and yellow.