Glock, I wouldn't move from an overwintered Lang to a TBH. A chop and crop is hard on the bees and in the end you have frankenbars that you are stuck with for some time. TBH's are fun, but decimating a Lang isn't worth it.
Along the same lines as KillerBee if you bars are 19 inchs buy 1 1/4 you could get a little comb drawn on them by putting a single bar in a bunch of your hives. Just don't leave them in until they are fully drawn or you will need to trim them.
You could do a shaken swarm as well. Or you could put out swarm traps to get a swarm. Or you could sell the nuc and purchase a package and a case of beer, probably pretty good beer!