Supported MySQL version

I am running 3.6.0 on an Amazon RDS with mySQL 5.7.  Amazon is requiring 
me to move to mySQL 8.0 next week.  I did a test migration a while back 
and JAMES crashed and burned.  So I backed out the change.  I know I 
should move up to the latest JAMES.  But I'm out of runway and I haven't 
even had time to research how much work it's going to be to migrate to 
3.8.   Before I head down that path, am I right in interpreting all of 
the errors to mean that is understood that JAMES 3.6.0 simply cannot 
work with mySQL 8.0?  Or could there be something else that happened 
with a simple fix such that I can keep my same install and upgrade mySQL 
and keep going at least to take a little pressure off of fixing it or 
all mail stops next week due to the Amazon change?  Just looking at my 
alternatives.  I guess a 2nd question is... how painful/painless will it 
be to migrate an existing 3.6 to 3.8?

Thanks.

Jerry