Lucas Hood (always wondered where you went after "Banshee" ended) - actually GC and HPLC are much more similar than they are different. I'm experienced with Agilent equipment and software, and their GC and HPLC softwares are identical except for the one column about instrumental conditions.
Both use fluids to push components through a column. Myself, we had Agilent (HP then) come in a train our entire department in 1980, then we developed our own test methods and validated them; things may be easier these days with computer searching.
Training a person to operate HPLC and do simple troubleshooting is simpler by far than learning method development. I'd suggest an HPLC hands-on training course, but you might need to fund that yourself.
Or try convincing a prospective employer that at one time you didn't know GC either, but have capacity to learn (like Dana Andrews did in end scenes of "The Best Years of Our Lives", 1946).
I trained about a dozen people in our company in HPLC who had no experience; unfortunately, I don't seem to have that tutorial document any longer, since retirement, I could maybe check...