My name is Max Sadlowski and I am the lead developer and CEO of BentoSMB Inc. We are looking to build out a Shopify POS application that solves your specific need and I would love to hear more about how we can do that. There is more information and a form to fill out if you can to give us more details about your needs.
You can find the form here: https://forms.gle/u3p13uxK4grPB4z39
Please feel free to reach out directly as well if you have any questions.
We made this app, Draft And Custom Orders For POS, (https://apps.shopify.com/draft-and-custom-orders-for-pos) to solve that exact problem
Before this app, you would have to go into the Shopify Admin (on the computer) to create or edit a draft order, and then in order to checkout/charge a customer, you would have to email/send them the invoice link or charge them through your computer.
Now with this app, you can create a custom draft order right within POS, and you can add that draft order straight to the POS cart in order to checkout/charge the customer inside your retail store or in person. Much easier and simpler!
We have a few merchants already using this for pop-up-stores, boutiques, and roadshows. When you create a draft order, you can choose to email a copy to the customer, alongside a link for them to checkout/complete the purchase :)
With Draft And Custom Orders For Shopify POS you can now do the following all within the Shopify POS app for any device: