Yes ... that'll work ... I've done that more than once ... in fact, until I got a desk-top humidor for work, I used a wooden cigar box with a humidfier in it for almost two years ... made the humidfier myself on the fly too ... at Rite Aid, I got a small tupperware type condiment container, about the size of a small jam jar and some distilled water ... stopped at the florist in the next block and got a chunk of wet florist foam, sqeezed the tupperware jar down into the foam, trimmed it off, poured water in to saturate the foam, drilled some holes in the lid of the container and put it in the box ... I later added a 50/50 mix and have replenished the water as needed ever since ... it works like a charm
About Thanksgiving, I saw a 50ct humidor for sale in a little store a couple of doors down from the florist ... this store sells a lot of assorted stuff from estate sales ... guy said 'this USED to be a humidor, but no gauge and no humidifier so it's just a nice box now" ... he let me have it for $15 and I seasoned it as you have yours ... transferred the contents of the cigar box just before Christmas ... but I kept the cigar box ... just in case I have an 'emergency' such as a stealth trade or purchase ... LOL