score:6
Yes, almost all resorts in Ogoto Onsen offer day trip (日帰り higaeri) plans, ranging from a simple dip to packages with meals. Here's a list (in Japanese) of 9 onsen with day trip plans:
https://tabijikan.jp/ogoto-onsen-day-trip-spa-35276/
For example, here are the meal-included day trip plans at Yumotokan, and they also offer onsen entry only for ¥2000/person until 9:30 PM.