Speaking at the Financial Services Expo Glasgow 2017, Ewing (pictured) said the industry needs up its game to educate brokers on when the products are appropriate.
The second charge distributor is offering the product through provider 1st Stop with a maximum loan of £50,000 and terms from 24 to 300 months.
The office will be staffed by second charge mortgage advisors Thomas Wall, Steve Corns and George Tuffin.
The portal gives advisers the ability to make quick decisions in principle as well as allowing brokers to process applications easier and also track their status.
Central Trust is joining Masthaven Secured Loans, Precise Mortgages, Paragon Personal Finance, Shawbrook Bank and Step One Finance on the panel, which launched in November.
Yorkshire Building Society increased lending to first-time buyers by 45% in 2016 to £1.3bn.
Shawbrook completed one of its largest refinances on its commercial portfolio that the bank has ever undertaken at £7.7m.
Spreading the word about the value of second charge mortgages is akin to turning a super tanker, Enterprise Finance sales director Harry Landy has lamented.
Seconds lender Equifinance claims the profile for customers taking out a second charge mortgage has changed significantly against the backdrop of CCJs in 2016.
The rate of repossessions has fallen from 0.34% of mortgages in 2009 to 0.07% in 2016.