So I have made a basemap map and save it out as a mapx in my project folder. It shows up in my Basemap dropdown in the Map tab of the ribbon. I can close this basemap and it stays in the basemap dropdown. I want other projects to be able to use it without importing the mapx. I also want to share with other users in my organization. I don't want to publish it with server (even internally for various reasons such as maintenance, source is external, accessibility, language, toponymic standards.) Basically I want to take some arcgis online services, strip out the labelling, change the projection and use the new basemap as a background for data editing purposes with ArcGIS Pro. I can make a layer file (lyr or lyrx) but seems like an ArcMap way of doing it and also doesn't show up in the basemap dropdown, I then also have to share by putting the file in a network directory.