when you are forced to use range

It depends of team composition. In situation with condition reapers team (If no one run Spite for vulnerbility stacking) your team will lack fury (I often see druids who does not provide it) might and whats most important - vulnerability. Without it, necromancers lose Decimated defense, and you as mesmer will not benefit from [https://wiki.guildwars2.com/wiki/Fragility](Fragility trait] And trust me, its really bad.

So, what to do with all of this? Here is my opinion -

You will need - Imagined burden, sigil of strenght, as much boon duration as possible and with situations with trash mobs, chaotic interruption trait with Sw/Sh Sw/F weapon combination. And ofc you always use signet of inspiration in order to share all your buffs. In most of situations you need to keep 2 avengers up all the time. Last slot is free, if projectiles not a problem, summon basic clone with sword for extra vulnerability.

Ah yes, vunlerability. Second sigil in your greatsword is [https://wiki.guildwars2.com/wiki/Superior_Sigil_of_Frailty](Sigil of Fragility). Not best solution, but better than nothing. Better to ask one of necromancers to use spite, but you know PuG. Sometimes it smart person who really knows what class can do. Sometimes its very ignorant lazy person.

And, at last - Fury. Unless Anet let us change runes on fly without losing them, I wont recommend to use Pack Rune in this setup. Ask your druid for fury. I wont recommend you experiment with condition build (thus phantasmal mages as source of fury/burning) outside of guild/friend runs.