SS and VS should start a joint venture together. The looks and dynamics of SS with the functionality of VS 
Careful they don't ban you for that! Like going to Rome and suggesting the Pope becomes a Moslem!
Joking aside, I think the underlying engines will be so disparate (or desparate?) that it would require a totally new programme on one or the other engines or a new engine altogether.
Don't forget that neither vestp or hangedsim write the engine programme itself, but 'just' the programmes that use it.
BTW: For anyone who wants a solution to the wind effects issue... May I suggest alka seltser
