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Hello Alex,
For sure!
This would require working in 3 directions:
1) Redo the SWR bridge under LF, which is straightforward - a good starting point might be??
Also the works of David W. Knight are a must -?
2) At LF you need a lot more inductance and capacitance to be able to cancel out reactances. This implies using larger coils and more, more, more caps. Also the L tuner might not be enough in some antenna cases and loading coils might be required before the ATU, at the antenna. Placing the ATU closer to the feedpoint will also be better.
3) At LF with electrically short and highly reactive antennas one will encounter very high voltages, especially down there at 100kHz. The whole antenna / ATU system has to be designed to handle those with ease, and it will be more expensive to achieve this than a PIC, PCB and some coils, caps and cheap relays. You might have to go HV on all components.

Taking into account the above, a switchable tapped coil / motorized heavy air variable capacitor might be more appropriate and sturdy in this case, than a design lie the ATU100. Keep in mind, that people sometimes get 3-4-5-6kV at ATU terminals even at 5-10W at LF.?

Best regards!
Bill