If you get the Rx 5ml=5mg solution, you can be 100% confidant that every ml of solution will contain exactly 1mg of diazepam.
That's a far greater level of precision than your tablets, which typically vary +/- 5% tablet to tablet.
Look, if you don't want to do a liquid taper, then don't. You're obviously searching for reasons not to do it.
I tried doing C&H with tablets and it was always difficult, until it became impossible. Liquid was easy, and gave only occasional, minor sxs.
And you know, if you try it and don't think its working, then just back to tablets...no big deal.