Fleximage get a resized thumbnail

I am using for the first time the Fleximage plugin… good, I can upload
and resize images on the fly before storing them… User has-one Image

I need to get a very small thumbnail to be stored directly into a
tinyblob field of the user record… ,
I know Fleximage is able to produce thumbnails, but regarding
performance I’d prefer to store the thumbnail direcly into the user

resize! is resizing the original stored image, how can I get a clone to
be thumbnail

I would appreciate some help from other Fleximage users…