Yeah that must be quite a challenge.. have you thought about nursing homes that might have observation hours options during the weekends?
A lot of clinics/hospitals have much lower PT staffing on the weekends. Also, generally you want to observe with the same PT to build a connection/earn a recommendation, and they may only work one Saturday a month. I found it incredibly difficult to find obs opportunities on the weekends and ended up going down to part time to get my inpatient hours in. Definitely a big challenge to fit observation and night classes in with full time work.