Add a "Custom Mob Adder Block" to build, color, and program custom mobs

Hello Mojang Team,

I want to propose an advanced tool for map makers that would work completely in Vanilla Minecraft (no external mods or add-ons required). It is a "Custom Mob Adder Block" obtainable only via commands. This block would allow players to build, customize, and program their own entities directly in the vanilla game using a visual GUI.

The block's interface should include:
1. Base & Passenger Selectors: Choose from ANY existing vanilla mob or entity to stack them together (e.g., combining an Armor Stand and a Ravager to make an Elephant).
2. Full Color and Variant Customization: A built-in feature to change the vanilla colors, skins, or textures of the selected mobs.
3. Behavior Editor: Simple toggles and sliders to program how the new vanilla mob behaves. Creators could choose if it is friendly, hostile, neutral, what it attacks, its speed, and whether it follows player commands.
4. Position Offset: Sliders to adjust X, Y, and Z positions of attached parts to perfectly align them.

This block would give Vanilla Bedrock creators the ultimate power to create unique creatures, variants, and bosses completely within the stock game, without needing any external behavioral packs. Thank you!