What you are suggesting is quite impractical, unless you are a really big business with cash, which can simply direct order components.
Small businesses, even in Shenzhen, a place inundated with supply chain abundance, always have to either keep running from one small wholesaler, to another searching for components, or pay n-times the price working with somebody like Arrow.
In my experience, you can't safeguard yourself against such things as a small company no matter what.
I worked in, and around OEM electronics since 2007, and things like having to redesign a product 4 times a year to accommodate a supply chain disruption were happening even in the best years. Nothing special with the current disruption besides the scale.
This is also the reason why Asian electronics makers have such short product lifetimes. It's usually easier just to sunset a product, and make an improved, and better version with newer components, than to fight against the always evolving supply chain. And I not talking about small companies, ASUS, Acer, MSI, and such all practice this.
I know few people running the Chuwi brand. What they do as a small maker is that the moment the get a good consignment of chipsets, and other parts, they spin a laptop model solely for that batch alone.
Then, they live off it until they get another good parts purchase, when they usually sell their component leftovers, or do few final runs if they can find people wanting to buy them for rebadging.
The entirety of small volume laptop industry spins around chipsets, and screens — hardest things to find for a small company.
I want you people to take a looks on a big difference in how companies in the West, and here handle the crisis: Western brands wail, cry, and wait for component supplies to resume, while Asian brands just keep releasing new products with parts coming into their hands, and making great cash from this shortage.