To be honest I would caution against simply using those two verses as they need to sit in with the rest of the Chapter. V1-6 states:
1The souls of the righteous are in the hand of God, and no torment shall touch them. They seemed, in the view of the foolish, to be dead; and their passing away was thought an affliction and their going forth from us, utter destruction. But they are in peace. For if to others, indeed, they seem punished, yet is their hope full of immortality;
Chastised a little, they shall be greatly blessed, because God tried them and found them worthy of himself. As gold in the furnace, he proved them, and as sacrificial offerings* he took them to himself. 7In the time of their judgment they shall shine and dart about as sparks through stubble; They shall judge nations and rule over peoples, and the LORD shall be their King forever
It is unlikely that many non-Catholics would see this as supporting Purgatory as they may argue that everything took place before the person died and they are now at peace. The most obvious reference is Maccabees 12: 42-46 but that book is not accepted by a number of Christian denominations.
Have you read the explanation on Bible 101? It can be found at: catholicbible101.com/purgatory.htm. This might be a bit of a firmer base to move from? I thought I would put the link rather than try to condense the information or lose some of the related references.
I expect that you will get more knowledgeable responses from other more experience CAF members, so this is just a starting reply.