There is no problem having a line tee off prior to the CSV1A, as long as that line is used at max pump flow, or just occasionally to fill a dog bowl or something small. Reduced flow rate in that line will still cause the pump to cycle on/off, so it should be used with caution if at all.
Also no problem using flow or pressure sensors, as long as they don't have any control of the pump/motor. Monitor all you want, just let the CSV and pressure switch run the system.
You need to check the max pressure allowable for the filter. Then check the deadhead pressure of the pump less the static water level. Make sure that the backpressure from the pump does not exceed the rating of the filter. If it does, put the filter after the CSV.
The CSV is designed to handle some sediment. The design of the bypass prevents clogging with debris. But any device will last longer if you can keep the debris out.