Correct FVM, those are about as small a reed relay that is reliable and that is he can afford >$5k MOQ for 1kpc. unless there is some overpowering reason for 1.5 kV isolation any high side SMT SOT23 MOSFET switch should work. $1 3x1.7mm
I dont want any isolation i will use it for making for variable resistance chain as an array. because i will have 16 relay it is very desirable to be as small as possible.