Using Conversion tool from DnD 5(.5)e, but need advice on gold

Level 5 DnD party is considering switching from DnD to LitM having recently finished Lost Mine of Phandelver. The conversion tool has been very helpful for most aspects, but I'm iffy on the parties combined treasury. They're sitting at around 900 gold currently. The paladin would like to buy plate armor, which costs 1,500 gold. My tentative solution is to grant the party a story tag of Wealth-2, then at Wealth-4 (achieved in maybe 2 to 3 more sessions), the paladin can purchase the armor without making the team destitute, sliding them back to Wealth-1. Does that sound fair?