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@Jake Lo one additional comment: in order to be able to install Monterey with the online installer, I needed to change one entry on the config.plist file: Misc - Security - SecureBootModel was set to "Default" and needs to be changed to "Disabled". Otherwise the pen drive boots into the recovery mode. When you click on "Install Monterey" it downloads all the needed files, but after the first reboot, something crashes instead of showing the Apple logo with the legend "XX minutes remaining". Hope this helps.

I disabled the AlpsHID.kexts entry in the Config.plist and the mouse is now working perfectly. Thank you very much @Jake Lo!!

Thank you for your help @Jake Lo. I was able to update my Latitude 7490 to Monterey, the WiFi is working fine. The only thing that has stopped working is the touchpad and the only way I found of using the laptop is an external mouse. Is it possible that its kext/s has/ve changed? Can anybody please help me showing me which kexts from @Jake Lo's EFI to remove and which ones should replace those? Thanks in advance!

Here you go, give this a try. Updated to OC 080 with latest kexts Select config-intelwifi and rename it to config.plist if you have the Intel/BT combo. Latitude 7490 OC0.8.0.zip