Here are a couple of ideas for helping such children:
1. Take their books with you and visit them in their homes. Organize other K4T workers who want to help such children: Pair them up, give them the Truthbook(s) they need, the child(ren)'s address(es), and pray for them as they spend some time in the child(ren)'s home working with them on their Truthbook(s). This could be done once a week (on a Saturday morning or afternoon, a Sunday afternoon, etc.). This will help children learn essential truths about our great God and Savior, build important relationships with the children and the parent(s), help prevent these kids from becoming discouraged, and make for better stewardship of the dollars invested in the excellent Truthbooks.
2. Incorporate the K4T curriculum into your current children's church ministry, or begin one. Instead of having the children do a coloring page or play games, etc. after the lesson, have them work on their Truthbooks. If your unchurched K4T kids do not currently come on Sunday, this would be an appropriate way to motivate them to start coming. This may require more workers than you currently have involved in your children's church ministry. You may consider recruiting mature teens and older adults (who may not typically be involved in this type of ministry) to come in and help the kids with their Truthbooks on a rotational basis. Or, if there are not enough workers for this, you could break the kids up into groups and have each group work together on one answer. To make this even more effective, you may want to switch to using the K4T lessons that you may not currently use in the club for your children's church lesson material.