A very un-official solution....
Internally the LFO rate is stored as 14bit value in the preset, which also means that rate can finer grained that can be achieved with Knob or CC.
There is a SysEx message which can set just the LFO Rate to the active program (ie. not written to patch memory).
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$ amidi -p hw:1,0,0 -S 'f0 00 21 1a 02 01 30 00 01 20 22 7f 7f f7'
^^ ^^ Param Value
^^ ^^ Param ID
^^ Param count
This lets the divisions be set as follows
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1:1 = 16383 (0x7f 0x7f)
1:2 = 16382
4d = 16381
1:4 = 16380
8d = 16379
4t = 16378
1:8 = 16377
16d = 16376
8t = 16375
16 = 16374
16t = 16373 (0x7f 0x75)