I'm working full-time and trying to pay off my loans while saving up for Interview hotels/flights. I'm grateful to have the FAP waiver, however, that doesn't cover any interview expenses, which rack up! Just going to the mid-west from CA costs $800 once you add transportation/food onto the existing cost of flight+hotel. I found myself having to open up new airline cards just so I use the bonus to cover the flight. Limiting myself to only west coast II's from now on would save me money but I'd hate to put myself in that situation. Can't be too picky in this process. How do some people casually go on 10+ II's and act like its nothing?
I fully funded my application while on FAP and working full-time(I was living at home in FL but eventually did need to pay rent which was not as high as rent would in Cali so there's that). Ended up going to 19 of 23 IIs.
So first thing, you may need to look into income-based repayment for any federal student loans. When I was working during my gap years, I was thinking the same as you and trying to pay down student loans. Now, looking back should have been on IBP from the beginning. I could have redirected the money being used to pay loans into my savings acct to be available for my application. The student loans I had would go back in deferment once I was in school so that was my reasoning in the end.
I got a Chase Sapphire card and put a few K on it in flights, food, etc. and also unlocked enough points for like 2-3 round-trip flights. If possible, for flights travel really light and/or fly airlines like Spirit, JetBlue, United. I also used apps like Skyscanner, Google Flights, etc. to monitor good times to purchase flights, buses, or schedule interviews. Also, try stacking interviews in the same city so that way you aren't going to the same place twice.
For work, if you're getting them, use PTO/sick day hours. They were a decent cushion for me but your circumstances may be different. Also, I was super transparent about the process so my bosses and coworkers really worked around my schedule.
student hosts are a great but unfortunately only 1/3 of my II’s have offered one so far
I'm sorry to hear that you're experiencing this. Some schools may not be the best at marketing programs such as this. I would follow-up with admissions still and see if they may have something available to help even if it's not student hosting. For example, I know some schools can get you discounts at local hotels that they partner with if they don't have student hosting or interviewees want to stay at hotels. I would also look into hostels or see if any friends or family live in the areas that you're interviewing in. Keep hustling and grinding and you can make it work. I hope any of this helps. Good luck.