Obviously.well, a good dojo could be recommended, but you’ll find plenty of YouTube videos on both techniques. Finding them together on YouTube would be a bit harder, as uchikaitennage has a ending which is missing here…this is not a mistake, though: he obviously does it to make it more choreographic, but switching to a different technique *is* what you are supposed to do if you lose your hold on the uke and let them recover their balance. And that straight iriminage is really an obvious choice from that position.
Local aikido dojos are hard to come by. And YouTube is, well, YouTube.