I would doubt it, at least "easily".
When an Eq mount just tracks it doesn't need the Dec motor.
When an Alt/Az tracks it has to adjust in both Alt and Az so uses both motors.
Consider a star just rising in the East the movement is more or less all vertical, so Alt only. When it is due south all movement is basically horizontal so Az only, and when West it is again vertical, so all Alt, only but now downwards. Between those 3 positions the movement ois a mix of Alt and Az determined by Polar-Cartesian conversion.
Whereas on an Eq one motor (RA) driving just one direction and at one unchanging rate takes care of it all.
Having said that if I recall some handsets determine the nature of the mount - Eq or Alt/Az. The old easy way was a set of jumper switches.
If (and only if) that is still used then by setting the jumpers to say the board/mount is an Alt/Az then the handset may control the mount as an Alt/Az.
Bit of a gamble as the idea is "old" but worked and may of the hardware and so software is from that era.