That’s only 20 per day, perfectly doable at normal speeds surely? And anyway recording a 7" 45rpm single of typical length 3 minutes will only save you 2.2 minutes - you still have to do all the post processing which will be the same if you use 45 or 78 to record.
The best additional tool you may want to consider is Brian Davies’ excellent ClickRepair - it costs a little at US$40 (but that less than 7c per single) but it produces excellent results and does so reasonably quickly (you do get a 14-day free trial which could be just long enough for you …). See this sticky thread: Click/pop removal - ClickRepair software
I record with Audacity, export a 32-bit WAV file, process that through CR and then import the resultant cleaned WAV back into Audacity for processing. This has teh added advantage of giving me a high-quality 32-bit WAV of the original raw recording if I ever want to go back and re-edit.
WC