I know it can be quite saddening here in the states. Luckily there are some methods of control that homeowners can do to slow down the invasives and help stimulate native plant growth. The book, Garden Revolution goes into greater detail but it states (and I have used this method with success) is to selectively prune back nonnatives every year while leaving the the natives along as well as planting natives with similar competitiveness so that as the invasives are drained of energy trying to regrow year after year, the natives constantly have more energy to root out, branch out, and seed out the invasives, eliminating them from our yards.
I should note that I am also an (obsessive) amateur and I've almost exclusively dealt with invasive shrubs and larger vines, so I'm just dipping my toes in to chemical control of other plants.
If it were my land, what I'd do is "cut stump" all of the larger climbing vines with 20% glyphosate/water ASAP since those are likely to broadcast the most seed and cause continuing major issues. I've used this stuff in a 50/50 mix with DI water to good effect on wintercreeper: https://www.amazon.com/Compare-N-Save-Concentrate-41-Percent-Glyphosate-1-Gallon/dp/B00ARKS3XO
Then I would mow/weed whack CONSISTENTLY as much as you could for about a summer and see how much that reduces, and from there either continue maintaining mechanically if you have the energy, or do a foliar spray when the infestation is (hopefully) a lot smaller.
Keep in mind that you'll need to stay on top of it for at least a few years and go out every couple of months to find any that have started growing from the seed bank. If you're effective and the forested area is somewhat mature and not totally wrecked you should have minimal issues after about 5 years. This seems like a long time, but you'll be surprised at how quickly it goes by, and how satisfying it is to restore and area!
I used a cheap hand pump sprayer from home depot. I forget the exact dilution, but this is what I bought: https://smile.amazon.com/dp/B006LAJ6P8/ref=cm_sw_r_cp_apa_i_nEu.EbWJPCPX9
If you look at the hopper at the top of the bottle, I used about half of what's shown in the Amazon image per 2 gallons water in sprayer. Use a touch of dish soap/surfactant. There is a chart that comes with the bottle that you can use also.
The bottle will last a long time, which is good since milestone isn't cheap.