Booster seats

I’m ready to get rid of our highchair soon to create more room in our kitchen+ my 23 month old almost exceeds the weight limit. We have a kitchen corner nook with bench seating (the corner bench has a high back to lean against like a church pew and the other bench is just a traditional style.)

Does a booster seat that attaches to a bench exist? A quick look on Amazon shows plenty that attaches to chairs, but not a bench. Or does anyone have another idea for a solution?

Also, drink every time I said “bench” for a good time.