Appointment Booking Window in FSM - Pre-set values and PSO Response

Hello Everyone, reaching out to see if any one has guidance or recommendations to address a few requirements for a Customer; please see below. From what we know,  these are not available OOTB. However, if anyone happens to have any insight or approaches on trying to tackle these 3 that would be greatly appreciated:

Requirements:

1. Ability for user to enter window start (and/or window end) before initial screen (*Achieved by using task’s earliest_start_dttm and latest_start_dttm)
2. Ability to display first available if no slots are available within selected window start + window end (opposed to having to click next button each time)
3. Collect first available date as data point (on apt booking response from IFS PSO)