You dont have to look too far for a qualified mortgage consultant, there are several on this board that would be able to assist you with this.
Seasoning will only be an issue if you are trying to take cash out. If you are only paying off the existing HML then no big deal. As noted, many lenders will have a program for this.
However, if you are trying to take cash out then this may become a bit more complicated depending on what ltv you are trying to achieve.
As you get higher in LTV, it's less likely that you may qualify for a conventional loan. Most conventional programs have no seasoning. If you cant qualify for a conventional loan, there are less than a handful of lenders than can do cash out with no seasoning.
There some important questions that always need to be addressed for these types of loans too. Definitely work with someone who specializes in investment loans.
