Without the players, there’s really nothing you can do by yourself for these videos. Now the issue of working on your videos without compression, that would be an expensive venture especially since your then talking about working on Betacam SP or Digital Betacam. For simplicity’s sake, I just going to say the cost of working with these formats, for your purposes, would be very high and you probably wouldn’t retain enough quality to feel justified in go that route rather than mini dv. If you still want to go uncompressed, at least for the VHS tapes, you should buy an inexpensive vhs player, and you will need to run it through a timebase corrector to maintain the highest quality as you digitize. You will also need an analog capture card to capture your video uncompressed, AJA and Decklink make some very nice ones. Keep in mind uncompressed 8-bit video comes in about a gig a minute, 10-bit video about 1.25 gigs a minute, and you will need a RAID array to be able to capture that video without dropping frames. I’ve pulled it off with a two-way stripe, but for best results you really want at least a four way stripe.
As for your 8mm film, you might want to look for a transfer house that can do that for you. There is a device called the DV8 Sniper, check it out at https://www.moviestuff.tv/8mm_telecine.html That is made to transfer your 8mm footage to mini dv. It will probably be your best bet, since I recently was looking to get some old 8mm footage telecined to betacam, and it was actually more expensive than 35mm since it had to be sent out.
To be perfectly honest, you will probably do fine going straight out to mini dv for your vhs tapes, and using the dv8 sniper for the 8mm. Even though mini dv is compressed, for the sake of family videos it will look quite good, and be much easier to work with since the bandwidth requirements are very low. Also, most mini dv cameras that take a line in (I used a Canon ZR-65) have built-in timebase correction and will transfer from the vhs player nicely.