I don't think it's a good idea for a couple of reasons:
1) The spigot area will be difficult to sanitize
2) You're going to get a lot of trub settling to the bottom of the bottling bucket. There will be no way to thoroughly mix priming sugar in your beer when it's bottling time without stirring up all the trub. The trub will make it into your bottles.
If you want to brew again before the first beer finishes, find a local source for 6 gallon buckets with lids. Bakeries and restaurants are often a good source. Once you find an extra bucket or two, drill a hole in the lid and insert a rubber grommet to hold your airlock.
Oh and welcome to the obsession.
