Hi @biker99, welcome to the forum 
If you run huel through builtwith.com it looks like they’re using Shopify and the Order Limits plugin MinMaxify to manage restrictions on the cart. Adjusting that from a per product minimum to a cart value minimum (or indeed just removing minimum requirements) would take minutes.
But… I can see how the conceptual side of any changes would take deep consideration and a lot of thought since it’s not something easily walked back once changed, but technologically speaking, it’s definitely not difficult to update things unless they really go all out and introduce single servings of everything. For me though that’d go way too far.
I’d like to see everything kept available as it is, but let us buy one of things. IE: A single bag of powder, one box of bars, one pack of RTD and apply a minimum value to the order - when the minimum is hit, and where it makes sense (bars/RTD) allow single addons added like you do already with the RTD.
If the minimum isn’t hit, charge £5 postage.