If his powers stem from the Super-Soldier Serum, they shouldn't vary from bog-standard Captain America fare. (When they were MGH-derived, they could, in theory, ape all sorts of mutant shenanigans, depending on the batch, since we've seen, in Runaways, that you can get 'darkforce' MGH to get the powers of Cloak, for instance.)
So, yeah, tech it is, and T'Challa is one obvious source, but also Falcon, Moon Girl, Tom Foster, Blue Marvel, Toni Ho, etc. (and that's just possible tech-sources-of-color, off the top of my head, there's no reason why he couldn't get tech from Nadia or Scott Lang or something). One he's already got possibly tie to (Scott is Cassie's dad, Toni Ho was friends with Billy and Teddy when they were Avengers together, etc.) would be ideal, rather than just, 'oh, Night Thrasher or Hobie Brown totally hooks him up, 'cause...'
A shield that had some sort of remotely controlled (cybernetically controlled?) magnetic self-movement capability, and could be made to arc in flight, zip around a hostage and hit the guy holding the hostage, and then fly back to Eli's hand, could be neat. Just to go with something very different than Cap's shield.
Alternately, or perhaps in addition, instead of Falcon-style wings, or something lame like a skateboard, or a 'Cap-cycle' or whatever, perhaps his magnetically-movable shield could be *ridden* (with magnetic clamps on his boots, allowing him to stay steady on the triangular-ish shield, while it flies along via it's magnetic levitation trick).
Granted, there'd need to be some handwavium about where it's getting the power for all this flying around, and it could be a plot point that he's full of neat shield tricks at the start of a fight (since it can't have a fifty pound battery pack attached to it, and cables to a backpack power supply would kind of ruin the whole 'throwing my shield at stuff' angle), but the battery runs down and it's just a shield-what-blocks-stuff like any other if the fight goes on more than a few minutes.
I come from an RPG background, not just a comic-book-fan one, so I kinda want my super-peeps to have an offense, and defense, and a means of transportation more advanced than 'I take a cab' or 'I got no way of getting there, so Colossus throws my gimp @$$ at the enemy.'
It ruins your hero-cred if you have to take public transport to the fray.
So yeah, flying shield! (Magnetism? Rockets? I don't even care how! Just not teeny little wings. Namor's got that niche covered.)