I think that might be a good idea, just to clarify what the buyer is getting and letting them know in case they want to subscribe to get the 'full' version of the plugin.
Though I think that the goal of the project is worth subscribing for anyway, just to support you to this end.
A final question, which really is just a question rather than a suggestion, is there any plan in the future to collaborate with VisuStella to ensure compatibility with their plugins? I noticed, for instance, that the effect of the sprite leaning forward when sprinting that is applied by their Events and Movement Core does not happen when used in conjunction with MZ3D.