Why not just make it possible to change your main character? With a cooldown of 1 month.
That would give all your alts access to both the marketplace and strategus.
I think that is the best solution by far and I don't see why it wouldn't be possible technically.
This is exploitable, you could just switch your main for some strat battles, make money with him or loom something, than switch to different one...IF the switch would kill the main, no problem, but Devs made it quite clear you should only have one char for strat, if you want to play different role, respec (i know it hurts, but that is why it got implemented, to offer versatility).
What i would not mind is the idea of shared goldpile...getting annoying that i cannot upkeep my alt while my main is quite fine, i cannot sell looms from alt to make money for upkeep (still yet to retire on alt
). One way item transfer is imho also not a good idea, i mean, what else could that be used for than for looming your main. You make gen on alt, loom item, main takes over, one loom without need to actually retire your char or to pay for it, that is not cool.
I foresee people saying: but we invest time to alts, why the benefits should not be shared? If you want benefit on char, do it on him, or buy it for him.
Anyways, idea of some sort connection inbetween account characters is cool. I would totally love to see shared gold, i would not even mind if alt grinded money some small amount would go to strat to your main (but again, really tiny amount, do not make alts on same lvl as mains, as people would have no reason to play main). Again, i might seem a bit negative, but just spitting out my thoughts.
And for the one way transfer, if, why not to make it the other way around? Like, you know, main to alt works, but not the other way around. With this you would prevent the possibility of equipping alt with looms, as they would be stuck with them forever, but also you could equip your alt without him actually having any money at all
What came to my mind while typing this: IF the dev team would liek to somehow prevent exploitations on strat, why not to make a new char class: Strat, so you would have main, alt, strat char, if the gold was shared, no problem with the strat char not having anything to wear or stuff