Repointing a stone wall to help bees

I have a stone boundary wall in my garden which is about 150 years old and ready for a repoint. It really needs doing, and in real event years has been under a bit of an ivy attack, which has now been eradicated.
Technically this is next door’s wall, but they will not be paying to repoint my side of 15m of it when they have that 15m plus another 60m or so round part of the rest of their plot.
At the moment there are a number of bees that live in the cavities I think.
Can anyone give me any suggestions about how to repoint to help bees, or other things I could do to mitigate.
Thanks.
F
Detailed pic

Technically this is next door’s wall, but they will not be paying to repoint my side of 15m of it when they have that 15m plus another 60m or so round part of the rest of their plot.
At the moment there are a number of bees that live in the cavities I think.
Can anyone give me any suggestions about how to repoint to help bees, or other things I could do to mitigate.
Thanks.
F
Detailed pic

“Rivers know this ... we will get there in the end.”
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Use only lime mortar on a stone wall.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
And one bit of N's wall has fallen down on my side, so 2m run needs rebuilding.
Ns are not going to pay for repointing my side of their wall, so I am staring down the barrel of a largish invoice, perhaps 8k or more.
F
Need to get quotes in the next few weeks.