Here is what comes to mind:
1. Power Macintosh G4 MDD (or any Mac that can run OS X Tiger (10.4) *and* 9.2.2 ) running TenFourFox on Tiger. Have at least 2 partitions on your G4 – Mac OS 9.2.2 & 10.4.x. Buy and install an ethernet card in the compact mac. Launch the Mac OS 9.2.2 drive in the MDD use File-Sharing to connect the Mac OS 9.2.2 drive to the compact mac.
2. Basilisk - If Basilisk II runs in Win 10, download the files with your Win 10 machine, bring them into Basilisk II environment, reassign the appropriate Type/Creator codes and burn CDs with files to be transferred to the compact macs. You will need an external SCSI CD-ROM that can be read by the compact mac in question. If your Win 10 machine has an IDE/USB zip-drive, 100MB (well 95MB)-zip disks can be used too, and, of course, you will need an external 95MB SCSI Zip drive for your compact mac.
Many of the downloaded files are available as disk-images and these can be burned directly to CD on your Win 10 machine. Personally, for these, I prefer to buy them on eBay when I can. They usually aren't expensive and I like have the case, the artwork and the manual. Files like drivers are good candidates for burning onto CD-ROM in Basilisk.
3. There is surely a way to connect a Win 10 PC by means of a PCI Powermac to a compact mac. There are guides available. I have never done it myself though and hopefully someone here will have a good link to it.
4. Sneakernet should also be possible. With a SCSI card in your Win 10 machine, you can copy the downloaded files onto a SCSI drive formatted in FAT. The external SCSi enclosure must be 68-pin. Almost all supported SCSI drivers in Windows 10 are U320 and have the very narrow 80-pin connectors. (I have an ATTO U5LD in mine). You will need an 80-pin to 68-pin SCSI cable to connect the SCSi enclosure to the Win 10 SCSI adaptor card. Secondly, you will need a 68-pin to 50-pin cable to connect the enclosure to the compact mac. Thirdly, you will an LVD SCSI drive that also support SE (Single-ended) mode. It is usually written on the disk (LVD/SE). Your compact macs cannot address more than 4GB at a time and even then 2GB is probably a better bet. Bear this in mind while looking at 74GB drives. A 9GB drive is probably better. Lastly, you will a small adaptor from the 50-pin on the cable to the 25-pin on the back of your mac. You will need PC Exchange installed to read and mount the FAT drive.
If you want to go the full hog on this, you could buy two 5.25" metal casing mobile racks (from a company like Icy Dock). These are drawers that allow you to pull the hard-drive out of the machine (while it is powered down obviously). With one drawer mounted in your Win 10 machine and another mounted in the SCSI enclosure permanently connected to your compact mac, it becomes a very simple matter of taking the drawer out of one machine and putting it into the SCSI enclosure.
5. Indirect sneakernet: If you have a PCI Powermac running Mac OS 9 or lower, you should be able to transfer files by means of a USB stick or Firewire drive. I have mixed results with this.
6. NAS drives – I don't know of any, but I wonder if there are any NAS drives that support AppleTalk. If there were, that may be an option.