I can think of two solutions:

Make the MSQ available to parties so that we can help our noob friends get through the 2.x slog by doing all the story instances and trials with them (synced or unsynced doesn't matter to me, might be a good way for someone to level an alt class actually)

Or

Separate the MSQ from the multiplayer dungeons / raids / trials entirely. Make it so that Ifrit HM is unlocked as soon as they meet ilvl requirement, but they still have to beat it again if they do it as a MSQ later

A lot of people only join this game to play with friends who are already at the endgame, and it would be in the interest of this game's longevity to NOT keep a huge boring solo grind as a barrier to that experience. Jump potions and such are not a solution