The thinking behind the Planetfalling suggestion was both to provide a 'reserve' that could come in mid-turn, and also one that did not suffer from BMs though the down side is that planetfalling troops may not end up quite where you want them

. It would also provide a Barrage or Pin-point attack to beef up that side of the list.
I was thinking of using the SM Space Cruiser as a guide - so 20x units deployed by Drop pod. This would give combinations of 2x Drop companies up to 5x Sentinel squadrons, though the optimum would probably be an upgraded company and two sentinel squadrons.
Planetfalling would be very analogous with the Market Garden situation because of the need to plot the drop zones, but is not quite as randon as people think, the 15cm move by the player means the zone can theoretically arrive up to 27cm on either side of the target area, though the average is 22cm, and the canny player will assume an average move of 7cm and play accordingly.
So, you would be paying 200pts to avoid BMs and get a spaceship attack, hoping to predict where the battle is likely to be in order to get a reasonable assault. Practical - yes-ish, but more importantly it would give an added dimension to the army that seems to be lacking.
SR3 is merited IMHO, and potentially give the Elysians the ability to chose to play corners, which makes the army more practical as it keeps the vulnerable on-table supports out of the way of many pre-emptive strikes.