SAGE 500 7.4.x SQL 2012

SUGGESTED

With SQL 2008 hitting EOL from MS this year, we are going to be doing an update .  We are not able to use 7.5 and above because the newer versions don't support custom payment gateways for charging credit cards. 

Is there any real technical hurdles for using 7.4.x on sql 2012 ?

Lastly, how do you stop the compatibility warnings from popping up?