New key combination

Good morning. If possible I would need that if I press a+\ I would get the character â, without press any other key. Can it be done with this program? Thank you.

Ah unfortunately macOS and BTT only support keyboard shortcuts that include one modifier key.

You could do it using a key sequence tough. However there the input will not be blocked (that's what modifiers are for), so you'd need to use the delete characters option:

Very good! Thank you!