As far as merchant ships are concerned the operating procedures whether R/T or W/T are internationally agreed. The are designed to assist operators of differing nationalities and languages to communicate.
Wilco, Roger etc never appeared in the operators handbook I learned procedures from. Why say roger when you can say received ? When in your MN career did you find the need to say "Will Comply" on R/T. I would suggest saying "OK".
I cannot imagine for example Scheveningen Radio using these meaningless phrases when working a Greek ship !
I know little about British Military Radio procedures but can only guess these words have some special implied meaning which I dont understand, or,
they have a movie origin offering pseudo technical terms which the audience can understand and yet imply technical competence to the onscreen character.
I spent a number of years working in GPO coast stations and use of such words was very much frowned on as being unofficial jargon which offered no benefit, only the oportunity for confusion. The emphasis was to use simple everyday english, especially so when working foreign ships on R/T.