Mono repair

I've to look at a mono repair job where the customer is making their garage wider so the ingoes will need mono applied to match the rest. Now I don't come across mono a very often never mind repairing it. So just wondering if this is the best method. I won't get an angle bead on the corner so should I just stick a stop bead on level with the existing render then seal the join between the stop and original render?

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