The picks I'd be offering to trade for future picks are 18, 20 & 23.
The problem with your thinking is you need to look at the actual players.
Armstrong is rated as 8-10 as the earliest key forward.
The next group of key forwards come in around 20.
Trading out each of 18, 20 and 23 means one less key forward.
Just based on Twomey's September rankings:
9 - Armstrong
19 - Shanahan
20 - Whitlock
22 - Faull
25 - Whitlock
Us getting 3 or even 4 of those forwards will fill our most gaping hole - key forwards
Yeah it's hard to know until the night.
I want (based off current opinions):
1 - FOS/Lalor
6 - Smillie
10 - Armstrong
11 - midfielder
18 - Shanahan
If we get those 3 then I'd be happy to move later picks to 2025, however like Redan said I'd be looking at Faull and Whitlocks also (W's can apparently go back).
We need to look at upgrade options on Miller/Young.
And our forward line is utterly F'd.