Just go for a higher pledge level that includes them. You'll get the two valuable promos as well. The $300 level is a good deal, as it includes the tokens, terrain, 3 expansions, and Goutard and Nox, which are very valuable on the secondary market.
If anything, I would just go for that level, as you could probably sell just the two promo figs for $125 quite easily.
The XXL figs come with the $500 pledge, and not the $300 pledge.
The $300 level gets you all 4 promo figs for the game, all unlocked stretch goals (likely 3 more promo figs, maybe 4), 3 expansions (12 figs), the terrain set, and the token set. The 2 promos that are most sought after are Nox, and Goultard for the game, not the XXL ones.
However, some people have already pre-sold their XXl figures for $100 or so. And, the $500 level gets all the stretch rewards announced, including those that aren't unlocked.
But, for you to get the terrain and tokens, the $300 level is where you want to be, as you'll get more promos than the other levels (the highly sought after ones anyways). If you want the $500 level, you'll get all the expansion figures, the XXL model, and stretch rewards that aren't unlocked yet.