AMF, this is question for your new (Reserve) unit. Are you being hired as a TR? If so, they expect you to line up full-time civilian employment. Does your reserve unit have any flexibility on FTU dates? Airlines don't take kindly to those that move their availability dates around after getting hired, especially by several months. You need to be available to start class on/shortly after the availability date on your app.
The window between your gaining date of Jan '20 and your FTU date of Apr '20 is barely large enough to allow enough time for airline training (indoc, systems, sims, IOE, etc.) before dropping a large chunk of mil leave. And that scenario only works if all the dates line up perfectly. Hopefully your new unit will provide you with some flexibility on FTU dates to allow you to pursue airline employment.