I am using the workflow explained in this tutorial for typesetting images in my document: Tutorial for pdf_tex using inkscape Briefly, a vector image is imported into inkscape and then image itself is saved as pdf with figure labels removed and figure labels along with their positions are saved as a separate pdf_tex file. Finally that pdf_tex file is used inside figure environment. It results in perfect consistency between document and figure label fonts. The MWE can be found from the link provided along with the necessary files.
Now the problem is that many journals require labelled pdf files to be directly imported in the main tex document. I can do so by manually saving each figure separately but I am looking for something like "tickz externalize" to generate pdf files separately with correct font so that after compiling once, they may be directly used in the main document at the submission stage. Any thing like "pdf_tex externalize"? Any ideas?