Is it true that single pole double throw solid state relay will not break before make?
You are trying to make a DPST (NC/NO) switch into a SPDT switch with break before make.
This requirement is the same as a half bridge that demands no shootthru between Vdd and Vss or “dead-time” yet these are tolerant to high V isolation and high blocking voltage so the cross conduction of switches will occur yet be only a transient less than the max load.  The chips themselves do not radiate EMI, but your interface wiring might.
All CMOS and this part included overlap at a higher resistance than fully on so during switching time the two sources have a controlled shoot-through current between sources that dictates using a d3coupling cap for each CMOS IC. In the logic case it is between Vdd and Vss.  In your case it would be between Form-A and Form-B.
If you need such operation then define the circuit impedance and voltage being switched, the required On resistance, switching capacitance and load current and reactance and dead-time between each or more explicit design specs for this multiplexing.