Hi DIWdiver, thanks for your reply, and you many other good replies here!
I'm considering then to skip the switch on the cannister, and put it in the cable inlet under my inflation valve.
Then I stand back with two important questions:
1) Cable gland. The selection of 10bar approved glands with long metric thread, suitable for 9.6mm cable isn't large.
I bought these:
Lapp skintop MS-M-XL
https://se.lappgroup.com/fileadmin/documents/technische_doku/datenblaetter/skintop/DB53112005EN.pdf
but after getting it I notice the odd fingered plastic/rubber insert, it is not a rubber cone. The waterproofing between plastic and brass is that the plastic is pressed into a brass cone. Does that really work??
2) over pressure valve. My cannister will be hermetically sealed, and considering an over pressure valve, which could be a regulator (1st stage) over pressure valve. Do I need one, and do you have better suggestions?