You can get an additional passive volume control such as this:

https://www.amazon.com/Nobsound-Controller-Adjuster-Amplifier-Switcher/dp/B074HW3575/ref=mp_s_a_1_5?keywords=headphone+volume+controller&qid=1664705669&qu=eyJxc2MiOiIzLjU3IiwicXNhIjoiMi42NCIsInFzcCI6IjIuMzkifQ%3D%3D&sr=8-5

To reduce the volume on your SE215s (connected to the output of this volume controller), for when you turn the volume of your E-drum to the highest to record.

You will also require an additional aux audio cable such as this, to feed the headphone signal to the above mentioned Volume Controller:

https://www.amazon.com/AmazonBasics-Stereo-Audio-Cable-Meters/dp/B00NO73MUQ/ref=mp_s_a_1_1_sspa?crid=3N1MNNK0CG88&keywords=aux+cable&qid=1664705777&qu=eyJxc2MiOiI1LjAyIiwicXNhIjoiNC44NSIsInFzcCI6IjQuNzIifQ%3D%3D&sprefix=aux+ca%2Caps%2C347&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyOVNPUVNZOFdINUM5JmVuY3J5cHRlZElkPUEwOTQwODU1NTlVNkFKUlg1VzlCJmVuY3J5cHRlZEFkSWQ9QTA2MzA1NTIzMjRTUUFLWkZEM1FVJndpZGdldE5hbWU9c3BfcGhvbmVfc2VhcmNoX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=