If you're looking for a linear electric sander, Proxxon also makes a nice one: https://www.amazon.com/Proxxon-28594-12-Volt-Pen-Sander/dp/B000NDGUXU.

You need an adapter for it however. The plus being that you can use the same adapter from their other modelling tools like: https://www.amazon.com/Proxxon-38515-Model-Building-Engraving/dp/B0017NU8SS/ref=sr_1_2?keywords=Proxxon&qid=1686578533&sr=8-2.