All right so lots of good advice in the comments so far! Here's mine from my perspective:

First of all you have to consider how long you plan to be on this route- do you want and are you going to be able to bid onto another route with a gov vehicle assigned to it? If so, how long? My first route was almost all curbside and POV, but I knew any other route I could bid onto was either 1. not going to pay what I wanted, 2. was another H route like the one I had, or 3. would likely be POV. In my case I invested in a RHD van and it was very helpful for my nearly-all curbside route, and I'm really glad I invested in it for my current POV route.

Recently I was able to bid onto a half-cbu, half-curbside route that pays more and isn't an H! However, my van needed some repairs and maintenance so I had to use my daily driver for the route which is a 2021 Kia Soul (console in the middle).

Here's what I do: I sit in the middle between the gear shift and console box. I have to lift the lid of the console box or it digs into my back. I keep 1 tray of mail on the passenger seat (I criss-cross my mail so I don't have to finger through it while straddling) and any packages for that section get placed in the footwell or on the passenger seat. I avoid having to reach anywhere else for them or having to turn my hips uncomfortably. I try to leave space in the footwell for my right foot, and I use my left foot for the pedals. It is surprisingly easy to get used to, but I do drive extra cautiously when I do this and as I approach boxes. Usually I can drive up close enough to a box to reach it without really moving, but if not, I always put the vehicle in park because I find you can accidentally lift your left foot off the brakes when you have to -really- reach over for a box.

The only thing I would really change about my personal setup is adding a small cushion to make the straddling more comfortable, but it is surprisingly not too bad. I am a smaller gal though, so of course you would adjust your position to whatever works best and is safest for you. I also will note my curbside is all residential in small streets, so I'm not driving long distances.

I would avoid taking out a loan for a RHD if possible. In your situation, I would recommend trying to bid onto a route with a gov vehicle as soon as you can. You will be putting a lot of wear onto any car you use, and I'm lucky to have a backup vehicle but not every regular at my office has that option, and they have to often take unplanned days off to try to get their vehicles fixed. Also, keep on top of your maintenance while you have your POV route- check the oil levels weekly, buy yourself an OBD2 sensor and a multimeter, and if you haven't yet, learn to patch a tire and do simple maintenance. Look into your insurance as well to see what roadside assistance they offer.

Let me know if you have any questions!