Well, yes, unfortunately. There's not really a way to profit from these sorts of videos unless you receive millions of views to make up for the cost of the licenses to perform the music, which can be upwards of $500 for each song. Really the best I can offer in return is credit on the video and maybe to collaborate on a video or project in return. So basically more traffic/exposure and networking. I really only work on vgm videos as a hobby of sorts myself.
I wouldn't mind paying to rent an instrument if the price isn't too bad and play it myself. However that'd hinge on how close they are to where I live, I'm sure. Trying to find a store for these instruments that's relatively nearby is impossible, but I have noticed that there are more musicians that perform these instruments than stores and closer too, although I doubt I'd have any success at all asking performers to lend someone they don't know their rare and expensive instruments. Hence I figure it'd be better to just ask if anyone would be interested or know of anyone who might be interested in performing online.