Driving without throttle linkage

I did exactly what you are contemplating.
I zip-tied the TV lever all the way back and road-tested it.
At light throttle, it shifted too hard.
I backed off the tie-back until at half-throttle it felt decent.
I drove it like that for thousands of miles. Thousands and thousands.
Your results may vary; my trans also had a Stage-2 shift kit (and a 2800 stall) behind a low-compression 4bbl 318. Part of installing this kit includes cranking up the line-pressure just a lil.
I would do it and not loose any sleep over it.

That mechanism does exactly ONE thing; it increases the Line-Pressure in response to throttle-opening.
This produces TWO results, namely;
1) the increased line-pressure increases the holding power of the various clutches and bands.
2) it suppresses the shift-command from the governor, and the result of that is a higher upshift rpm in "auto" mode.

If you tie that lever ALL the way back, you can do whatever you want with the throttle.
If you do not tie it back at all, you need to take it easy on the LOAD. This has nothing to do with rpm. You can rev the engine until it blows up. But you cannot floor it off the line. If you feel the clutchs slip, that's too much LOAD, so back off. And you better not attempt to pass anyone on the hiway. If you follow this rule, clutch-wear will be minimal.
If you tie it back about half-way between all the way back, and from where you first feel resistance to movement, you should be just fine. However, the 1-2 shift may be a lil late coming, and there is nothing you can do about it except wait.
For extra insurance, I ran a slightly deeper pan, with a slightly increased quantity of fluid.
I loved that 2800TC