Two years ago I faced the same issue of either getting my console clock rebuilt or quartz modified. Back then I don’t think #Rocketman was offering that service. I did learn that some companies were offering a generic wall clock quartz movement as a repair solution that proved unreliable due to the extreme heat cycles encountered in vehicles parked in the sun in hot climates. Made sense when I thought about it, but only AFTER I succumbed to a “really god priced quartz reproduction”. My bargain lasted less than one year. I then purchased a quartz replacement from a reputable rebuilder (The ClockWorks) and was very satisfied with their product. I just checked their website and learned they were having QC issues with their suppliers and are not currently offering quartz conversions. They still offer rebuild service for original OEM clocks.
Don’t go the bargain route, you’ll just be buying again.