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Whilst steppers are an ideal solution, and I'll second those modules as I've used them, one issue I found was gear reduction.
Not many are available with gearheads, and if they are, they're very expensive.
I haven't found any cheap high reduction gearheads or gearboxes.
It depends on the torque required in your setup.
If it is high, you'll need high reduction ratio , if low you may not be able to use 1/16 or 1/32 micro stepping to get slew rates you need as torque would be lower
Small Dc motors are readily available with high reduction gearheads and you could use a pwm motor speed controller that's around $20 odd on eBay
So one pot to set your speed, and a dt switch for reversible drive
Also you need something small to drive your altitude else you could have balance issues that could cause stiction in alt and increase load in az
Very difficult to control the speed of your existing motor as current would be pretty high and as Bojan mentioned, resistor in series is not recommended
I'd suggest using ball bearings on both drives, reduce weight as much as possible, then look at low rpm dc motors on ebay or other suppliers as well as multichannel pwm motor speed controllers. They can control more than one motor.
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