The relatively simple and cheap option are old school “bar ends”. They can be found in a variety of lengths and shapes. Sometimes they are in places like Walmart for dirt cheap too.
Ancient Onzo ones:
Some people even mount them inboard:
Just a couple examples from a search:
TOGS are a modern twist for an inboard alternate:
https://images.app.goo.gl/oJnaEMV8rg11HYR69