Yes, the more hints of Palpatine’s return the better I reckon. If you think there are more parts of the movie where a Palpatine hint could be dropped that would be cool. Eg When Kylo is communing with Vaders helmet. “I have been every voice inside your head”
FWIW, this is how I’ve tackled this in my sequel edit, though others may want something more insular to TFA itself for a standalone version: https://vimeo.com/549080534