I would suggest a) using whatever spare a/c capacity they have available within the existing fleet and :-
b) Eastern aimed at the business market with high fares and Manx 2 need to test market reaction to a different type of service.
I feel sure that they will very quickly be able to read the market and all being well, be able to offer a permanent service with increased frequencies.
The CAA stats for August (partially), Sept and Oct will make interesting reading. The route currently carries between 450 and 550 pax monthly.