“... would it be possible to route it to somewhere under Sender Hole (but NOT fouling Sender!), so that inspection and possible cleaning were options?...,”

And to go a step further (I’m about to get ridiculous), modify a tea ball with the long handles that fits over the end of the pick up tube and can be removed via said float hole.

https://www.webstaurantstore.com/1-3-4-stainless-steel-spring-handle-tea-ball-infuser/7145121.html