I am trying to push usage of Firebird for some of my customers smaller
apps (got to start somewhere!) and they always push MSACCESS because of
QBE, front end feature, interoperability with MSoffice ....

I know all the drawbacks of MSACCESS but it does not seem to be enough
to deter people from using it.

So .. does it exist something like MS-access, but powered by Firebird ?

I believe there would be some market interest for such a product.