Ionic v4 and old WebView (v 44)

I’m trying to have a Ionic 4 App run on a custom device that has WebView 44 installed ( version 44.0.2403.119) and not updatable.
The App starts but only shows a blank page and inside LogCat I can see these errors:

07-19 12:45:48.915 3687-3764/ E/Capacitor: JavaScript Error: {"type":"js.error","error":{"message":"Uncaught SyntaxError: missing ) after argument list","url":"http://localhost/vendor.js","line":77215,"col":49,"errorObject":"{}"}}
07-19 12:45:48.923 3687-3764/ E/Capacitor: JavaScript Error: {"type":"js.error","error":{"message":"Uncaught SyntaxError: Unexpected token =>","url":"http://localhost/main.js","line":718,"col":29,"errorObject":"{}"}}

I searched and discovered that probably a Ionic 4 App will not be able to run on WebView 44, is it true?
Is there any workaround to this?
Will Ionic v3 run?

From what I found, the only solutions seems to be using Crosswalk.
I followed what I found here:

with the modifications I described in my post in that thread and it is now working, with SVG icnos showing.