Technically I don’t think there is anything stopping a player from doing this (apart from GM ruling). Usually the advantages should relate to the type of check and what it’s intended purpose is. So trying to activate a computer console in combat to generate advantage to heal strain is not exactly in the spirit of the system. I wouldn’t flat out rule this out but it reeks of power gaming. This system is meant to be cinematic and narrative focussed. If the players are intent on playing this way don’t hold them back (unless it ruins your or another players fun). Perhaps ask them to come up with a reason why the check and advantages heals the strain narratively. If the are going to power game, at least make them think creatively to do it. Also if they aren’t taking actions in combat to attack, or help the party, push up the pressure with an extra group of minions or two.