In the win10 enterprise Beta at least, you could copy windows classic theme (classic.theme) from "%windir%\Resources\Ease of Access Themes" and get something derived from what you want. Then you may simply be able to change a few small things and save it as a win10 theme for your POS systems. You probably have also done this already but check that all the bells and whistles are turned off in performance options as well as managing services started.
Just got my free upgrade for my 7 year old laptop. It is a centrino processor with 4 GB ram. So far so good, but it plague with the disk use issue in which I believe someone at spiceworks probably have a solution for that already. I just did the upgrade so that I will be in better position supporting Windows 10 when I have to.
If possible, I would suggest to have the upgrade reverse for now and perhaps next year you may have replacement for those old machines anyway. 1GB ram running current operating systems is like asking to cramp 20 people in a van that can only fit 10. Possible, but not a good idea.
On Windows 10 right click on This PC, and then click on the Properties option that is on the bottom of the menu. From there click, Advanced system settings, then under the Advanced tab click on the Settings button that is by Performance. Then select the Adjust for best performance radial button, then click apply. That should give any Windows system a bit of a boost.
With everything configured, and within WSL on the command line, you should be able to just run composer install and yarn in your theme directory to install all dependencies, then yarn dev or yarn build for development/building assets.
Do you know how much developers are there who are using Sage 10 with WSL? It feels lot of hassle for Win users now with Bud. And cant really find a good step by step tutorial how to set up sage 10 on windows.
At the moment I found to much hassle going WSL and bud. Many different errors not on Sage side but to get stable enviroment working. Lots file permission and so on errors.
Went for last commit with laravel mix. I have been using Win all my life so Im an ordinary Win dumb user but some day I will try again.
When you use yarn install, does that command complete successfully?
Clean node_modules/ manually and retry yarn install.
When yarn install fails, bud may very well be not installed yet, hence the error.