My old XT3 Turbo has a "speed.com" file that can be manually run or called from a batch file instead of using the keyboard method. There may be a generic utility that will work on your XT. Or you might be able to write a program to do it.....

Fit a turbo switch. Bound to be a connector on the mobo. Also you may just be able to use a jumper on that connector.

dont know what chipset the Proton FE010A is based on but if its anything like the FE2010A , you could do it via bat file by passing data via debug to the correct register

https://github.com/skiselev/micro_8088/blob/m … ller-FE2010A.md

1Configuration Register
2The Configuration Register (I/O Address 0x63) is a write only register that is used for FE2010A configuration. If bit 3 is written, bits 0 - 4 of this register and the switch register are locked in that they may not be written to. This lock is removed by a system reset.
3
4Data Bit	Function
50	Disable Parity Checker
61	Enable 8087 NMI
72	On Board RAM size (bit 0)
83	lock register (bits 0-4)
94	On Board RAM size (bit 1)
105	Fast Mode (0 RAM wait states)
116	7.15 MHz CPU clock
127	9.54 MHz CPU clock

And a video of Adrian's Digital Basement doing something like this on a Compaq, the address would be different but I am sure the same idea applies.
https://youtu.be/GMrCf0w4BUU?t=2255

Since the NuXT and Micro 8088 motherboards use the FE2010A chipset, give the utility I wrote a try:

NuXT CPU speed setting utility