Lone parent will, foreign guardians, estranged local relatives

[Londonbabyland]

Looking for guidance in this instance:

Lone parent (mother) resident/national in UK, Father is known (DNA, CMS, no PR, no contact,never seen child, history of coercive control issues, history of living abroad so UK residence not guaranteed, UK national).
Mother's family all abroad. Father'family all in UK but unknown to both mother and child.

Mother appoints her family as guardians but because they're abroad solicitor advises that courts may intervene to avoid uprooting. Father's family theoretically can be appointed (adult children,siblings to child in question, aunts etc) but child doesn't know them and they might not know about child. Father didn't facilitate contact/intro and mother didn't seek contact independently. Uncertain if father will seek custody in event of mother's death as there's no contact between them. Mother is young and healthy in the meantime with life insurance, critical illness cover.

What would you advise?
-Seek contact with paternal relatives while mother is alive and well?
-consider moving country closer to mother's family (currently unsafe)
-appoint friends/trusted adults resident in UK as guardians?
-other plausible steps to plan for unexpected

Thank you!

Leave a letter, to be sent to Children's services in the event of your death detailing the lack of contact with DCs father, and the many reasons you've listed why he would not be suitable to have custody.
2.
Urgently consider making a friend in this country the guardian in your will. Someone willing, suitable, and known to the child, so that they do not lose not only you, but their whole world at once. This guardian could agree to considering the child moving to be with your family, if it becomes safe, and is in the child's interests.
3,
Don't even consider seeking contact with the paternal relatives: they may turn out to be totally horrid, but if you've established a relationship between them and your child, Children's Services may well be keen to see them as guardians.
And it's practically a guarantee of contact/ future custody with the unsuitable father.

A further thought: if the Father is not in contact, and doesn't have PR (so presumbably not on the BC), if you don't do 1. above, how are CS going to know who the father is?

So maybe just do 2., and have the friend promise to not give the Father's details?

@DancingLedgend thank you for elaborate reply.
Not on BC but on CMS (with occasional success), so presumably CS won't have issues establishing relations in said scenario? Unless CS and CMS never cross communication lines. What is the process practically if it comes to it assuming friend is named and will facilitate safe family reunion? How would CS find letter? And most importantly what should child know/steps to take? Friends details/number to start and means of contact I suppose?

Re horrid relatives - it's a valid argument though would the child not turn on family knowing mother didn't seek contact or attempted to establish family ties somehow?

Child's interests in mind ..
Really appreciate guidance.

I appointed my daughters godfather and his wife as her guardians in the event of my death. People she saw regularly and I knew would care for her as I did.