I think many things look favourable on Thursday including the shear conducive for severe storms and the strong steering winds aloft although not everything's ideal.
For example, I'd rather the midlevels be colder (but if surface heating is intense enough, there should still be enough instability for storms), capping along some parts of the coast, and the NW to W component to the flow through a deep slab of the atmosphere. The southerly change pushing up the NSW coast shouldn't play a major role for SE QLD, given it's not due to reach this region until early Friday morning.

One of the many favourable things though is the fact that the stronger part of the upper trough will stay south which means there's a lower risk of prolonged extensive cloud cover and rainfall lasting through the whole morning and inhibiting storms.

While overall rainfall amounts look pretty modest as far as our own region goes (especially due to the speed of any showers and storms), there could be some lucky places which get higher amounts if they get under any of the heavier activity.

So here's how I think Thursday will play out:

1️⃣ Overnight tonight/very early Thu morning could see some additional localised activity moving across inland areas near the QLD/NSW border as well as the northern tablelands and some parts of the MNC coast.
2️⃣ While early morning may see some cloud cover over parts of SE QLD, models suggest much of this may decrease later in the morning.
3️⃣ Mostly sunny hot weather then dominating with daytime max temps rising to a number of degrees above the October average (but the coastal fringe should stay a lot cooler than inland).
4️⃣ Strong northerly winds developing along QLD's southern coastal fringe & islands... as well as strong westerlies along the Great Dividing Range from VIC, through NSW (where they could even be locally damaging), and to the southeastern Darling Downs in QLD in the wake of the approaching front.
5️⃣ During the middle of the day, a band of low-rainfall showers & storms starts firing up over the central and southeastern interior of QLD as well as inland NE NSW. This band then steadily marches eastwards, possibly as a squall line, towards the southern QLD coast.
The strong shear also means that some locations could also get a severe storm with brief damaging winds or large hail (moreso for any individual storms separate from any squall line).
NE NSW is also a bit complicated where the further south you go, the earlier the drier W to NW flow breaks through to the coast and therefore, the lower the chance of storms.
6️⃣ Later in the afternoon or early evening looks to be the make or break time as far as the coast goes.

Inland locations look an almost certainty and the coast also looks a reasonable chance - but the latter zone looks like one of those setups where there's a fine line between the strong steering winds aloft dragging the activity to the entire SE QLD coast (and even intensifying/growing there after eroding any capping and ingesting the higher surface dewpoint air in the northerly flow as well as interacting with a bit of a seabreeze front).... or weakening in the capped environment. Either scenario looks possible (I'd probably favour the activity reaching the coast but I'm not 100% certain yet).