Samsung Galaxy Xcover 4s - SM-G398FN/DS (Europe)
OS Stock Android 9.0 (Pie), upgradable to Android 10 und Android 11, One UI 3.1
Hello @Craftater,
as the experienced previous speaker @tcecyk has informed you, neither Custom ROMs nor TWRP Recovery are available for the Xcover 4s on the aftermarket.
The only chance I see to run the Galaxy Xcover 4s with /e/OS is to install /e/OS GSI, as the hardware and firmware specifications are suitable for it: OS Stock Android 9.0 (Pie), upgradable to Android 10 and Android 11, One UI 3.1. However, according to your specifications, you will need third-party help for this.
/e/OS ‘Q’ GSI is a very versatile Generic System Image (GSI).