Yes, agreed with Tom, what I have stated previouly is with concern to FUTURE development. Sometimes I, and other bonsai enthusiasts, do tend to forget that "future" can mean very different things to someone with and without experience. A two year wait period before repotting is, IMO, a little conservative. You have to consider that you won't be potting down, but rather potting up. If this is the case, if you decide to pot up in order to grow them out, this can certainly be done this year once they've been completely stabilized and acclimitized. When potting up, you don't need to do anything more, in this specific case, then look at the roots for health, make sure there's no rot, grubs or other predators/parasites, that kind of thing.
On styling while growing out... well, you've basically two schools of thought there. First let me say that any pruning WILL slow growth and thickening of the main trunk.
Now, the loudest, most obnoxious school of thought will insist that you absolutely, 100% should not, never, ever, never, prune anything while growing out. This school's insistence sort of follows logic, though, IF you consider their blindered, cookie cutter methods. The end result, IOW, will be to chop the trunk anyway, leaving a single leader, if possible (sometimes it's not). So, any "styling" you've done above this line will be a waste of time and will inhibit (even if only slightly) the growth you're trying to encourage. This IS the fastest way to grow a fat trunk with a very pronounced taper, but, even still, can take an easy three years, using the thirds "recipe", minimum, up to 10 years or more, depending on the desired height of the finished tree.
However, there's a second school, believe it or not, that's a lot quieter these days, and significantly more zen (and IMO, true to more original bonsai principles) in their approach. Here, you'd be growing out, yes, so you'd minimize pruning as much as you could, but you'd still prune, and wire. You might not have a finished ideal in mind, or you might but it could change mid-stream as the tree grows in different patterns and lines. You develop the whole tree at once, acheiving lines and designs that may change over time as the tree progresses. And how long does that take? Ah, well, you could feasibly still have your tree in a proper pot in three years time, with a less thick trunk and a less pronounced, but IMO more natural, taper, but more likely the tree will take 5-10 years. BUT, you DO have an advantage there in that your trees have already been grown out for some time, just with no bonsai intent or purpose in mind, apparently.
Oh, and with the Trident, I'd repot with future Nebari development in mind. Check the roots, and if they're mostly growing sideways, great, you can leave them a little bit exposed to discourage high feeders that would other potentially need to be pruned and could leave scars. Otherwise, bury as you like and worry about Nebari after your trunk it where you want it to be.
If your trunks are nowhere near your ultimate goal, I would seriously suggest following the advice of the first school, unfettered growth in large pots (or in the ground).