Old Android WebView (74.x) --> update needed, ideas?

Hello Community,.

Since a week or so, one of the few Android apps I use…my banking app(Rabobank) states that I need to update Android System WebView.
When looking into this issue, I noticed that it is indeed quite old(74.0.xxx).
It tried upgrading(wont work) and installing new versions(beta and canary) which works, but I’m unable to change the default WebView in Android developers(you can switch to another WebView normally) settings because (I think) this: https://github.com/bromite/bromite/wiki/Installing-SystemWebView
(not allowed in res\xml\config_webview_packages.xml in Android framework-res.apk )

Anybody any ideas?
Thank you in advance!