So, does Charter have coax on the road? Is the only thing holding you back the cost of getting the coax down the driveway?
Here's a solution that is cheap and wrong, but it works.
You know how construction sites have a small pole (usually a 6x6 10 foot beam the ground) with a plywood backboard for electrical and phones?
You can get a coax CATV drop done to a "work site" demarc. They may say no initially, but you can do it.
You could create your own "construction site" temporary service pole near the road, within easy distance of an existing utility pole. Then get cable Internet service delivered to your "construction site", along with an electrical meter and small electrical panel (get the electrical first). It is easiest if you own the land near the pole, but you can get an easement in writing if needed from a neighbor, or just have the neighbor order it if you know them well.
Get a NEMA rated outdoor enclosure box to put the cable modem into, and power, and big enough to also hold some sort of old SDSL or VDSL modem (as part of a back-to-back pair). The VSDL modem will just be a straight ethernet bridge (plug the cable modem ethernet into the modem's ethernet, cross-over if needed). Run outdoor rated, gel filled Cat. 5 ethernet cable from your "construction site" along the driveway or in the woods. You can get 1000' boxes of this for about $130. More than 1000 feet? fine, get more boxes and splice the cable together (either yourself with tape or buy a real weather proof telephone splice kit for about $25 at Home Depot). Bring the Cat. 5 into the house, and hook up the other VDSL modem in the back-to-back pair, and then connect to your firewall or PC. The VDSL gear should train up at at least 5Mbit of service, maybe more (depends on distance). May not be as fast as the cable modem, but better than nothing.
You don't have the bury the Cat 5 or anything. You can just lay it on the ground, in places where it is not going to get driven over, at the edge of the woods and the driveway. The outdoor gel filled cable is UV resistant and can handle being totally under water without issue. This cable will last you at least 5 years, maybe 15 -- as long as your splices are good.
It might cost $500 in total for the materials (NEMA box, cable), the construction demarc pole, and a couple of used VDSL or SDSL modems (check ebay). Plus the cost of the electrical install, and the monthly electrical bill (likely minimum billing) and the CATV cost. But you will have broadband, and the total cost will probably be around $100/month.
Another variation on this is to get the service installed at a neighbor's house the abuts your property, and just run the cable there.