How can I write a letter to myself for a Digital Nomad Visa while managing UK rental properties from Thailand?

Update:

All approved without any further documents. Submitted as advised here, for which thanks to all.

Update 2.

Spouse/dependant visa now in too. 10 working days on the button. RTE Cambodia, no further docs.

Phew.

Anyway, apart from patience I learned a new skill at least: creating, merging and compacting PDFs!

Hello.

I own and run a portfolio of 9 UK rental properties remotely from Thailand and Cambodia. I have retirement visas in both and own a property in Thailand - usually need to fly back to the UK several times a year - and would like to change from retirement visa to DTV

On reading other people's experiences here, I've just opened a Ltd company with me as director.

Advice please on how to write the letter to myself saying I can operate this remotely.

Also, should I mention the property in Thailand/submit the yellow book?

Reason for wanting to change to DTV is that it isn't easy to have one's (in my case Cambodian) spouse accompany one on a retirement visa anymore (this is confirmed by Thai embassy, Cambodia). We will be applying in Cambodia.

Many thanks for your input