What beaker for milk. Toddler?

[JustLoveYourselfALittle]

My ds now 18m still has milk in a bottle. Other drinks in a sports type bottle or a non spill sippy thing

He's very attached to bottle and has too much milk. Due to eating issues, but slowly reducing. I thibk some of it is the comfort of a bottle.
I don't want him. Having the bottle still ideally.
My others both didn't have bottles from age 1. But had an avent beaker but I remeber it being a pig to clean.

He needs to still have the milk twice a day at the moment as advised by paediatriian, allergy people and dietician. Altho he's currently on 3 so trying to but the middle one out more.

Any ideas

Small glass bottle (like a coke bottle) with a straw?
You’d have to watch him at the table, but would be easy to clean.

I'm not sure if my suggestion will be helpful but I used a bottle which came with a soft spout and then progressed to a straw. My youngest is 20 though

We always used the basic tommee tippee first sippy cup

Just looked out of interest.. if you Google transition sippy cup You'll find something similar