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Shared inventory count across variants

Hi folks,

I’m setting up a webshop and I need some help with products/variants.

I’m setting up Product A with a limited quantity of 50 units, but offered in two variants (Brown Leather Strap, Black Leather Strap), where both variants count against the shared limited quantity of 50.
I.e., if a Customer 1 buys Product A with a Brown Leather Strap, and Customer 2 buys Product A with a Black Leather Strap, the remaining inventory for both variants should be 48.
The inventory of straps is–for all intents and purposes–infinite. (1000+ units).

What is the best way to set this up to ensure proper inventory count, tidy bookkeeping, and a nice shopping experience for the customer?