Lughaidh wrote:
to me using "conas" + object + verbal noun looks like a Béarlachas, even though it can be found in focloir.ie...
Ha! I am sorry to disillusion you, but focloir.ie is rife with Béarlachas. If you want to avoid Béarlachas, you would be safer to stick with Ó Dónaill.
Ó Dónaill contains it's share of Béarlachas as well. Better to go back to Dinneen. At least the expressions are older than 100 years (though still not guaranteed not to be Béarlachas of the times). And prior to Béarlachas there would have been Frainciseachas ...