Lockable window handle with roller shutter

Maybe someone can help here or recommend something; our house manufacturer currently doesn’t seem to have a solution.

The problem:
Our utility room also serves as a secondary entrance and a dirt barrier, so we basically have a balcony door as a side entrance with a lockable door handle that can be opened with the main house key. However, there is a flat handle installed so that the roller shutter can pass by it and close completely down to the floor.

Due to the design and the main use of the door, the handle is stressed accordingly and has already had to be replaced within 1.5 years because it wears out so quickly. Sooner or later, the next defect is basically inevitable.

Our house manufacturer also has no idea what to do or is no longer willing to deal with it, as there are more lucrative sources of income.

Maybe someone has a proposed solution here?

Why is it rattling too, because of the leverage? Do you know the handles that are shaped like a T? Alternatively, just use titanium or steel and not aluminum.
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What is a rotatable handle even for? I only have a handle bar or a push thing on both the front door and the patio door.

What is a rotatable handle even for? I only have a handle bar or push thing on both the front door and the patio door.

because that is a door without a latch.

Why is it wearing out, because of the leverage? Do you know the handles that are shaped like a T?

Alternatively, just use titanium or steel and not aluminum.
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No, I didn’t know those yet, thanks.
I think it’s wearing out because the door is used so often? During the week, the door is used 5-6 times a day when someone comes home or leaves the house, goes out to the trash bins or to the car. On weekends, correspondingly more.

That is basically our front door; the actual front door is basically only used by visitors.

because it is a door without a latch.

And you somehow have to put the thing in the tilt position, because it is actually a tilt-and-turn window. With the fixed handle, you only push it open or pull it closed.