Because the low pass filter cannot be set to 200 Hz in the dropdown, is there an alternative method withing the software to filter at 200Hz?

Answer:

unfortunately, there isn’t any alternative method to filter at 200Hz since the filter is on the hardware side of thing.

There aren’t many products for controlling analogy filters in the market. We only know the following item, and it looks like they can provide a special model (quasi-standard model) that can filter at 200Hz. We’re not sure it’s available in US. Please find an alternative brand as needed.

Signal conditioner MS3719 from MTT

https://mtt-ins.co.jp/d/wp-content/uploads/2020/01/2020.01.31-MS3700-MS3000-英文フライヤー-表裏（最終版）.pdf

https://mtt.co.jp/wp/wp-content/uploads/SpecSheet_MS3719_Rev19_E.pdf