Which mode is used when requesting the characters?

[AntonC9018]

I have a custom binding for romanian letters for modes c and i. I need to hold down alt and then press [ for it to print ă for example. This is done so that I don't have to switch the language constantly.
I want to use this binding to provide a letter when doing hop_hint1 for example, but it would insert the control sequence for alt, and then the letter instead. What mode do I have to make the binding for for it to affect the hop letter entry as well?

[AntonC9018]