Converting soft start to work with maintained contact switch

Hi, I accidentally bought a maintained contact switch and a soft start that is designed for a momentary contact switch. Is there any way to convert the soft start so that it works with a normal switch
Here’s a link to the soft start that I am using
https://www.audiophonics.fr/fr/soft...et-protection-pour-amplificateur-p-10225.html
On the soft start there is a Texas Instruments NE555P which acts as the timer delay for the soft start but I’m assume it also gets the input from the switch.
When I read the data sheet for the ne555p it said you could use it in monostable or astable configurations. Is this what I need to look at to figure it out or can I just solder the switch into two points on the soft start to fix the issue?
 

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