TL5: You could definitely do that, but now you're adding another device to your signal chain. Using a more appropriate power amp would be a simpler and likely less expensive solution if you didn't already own a power amp. Your solution would work great if you had a power amp with high input sensitivity that the VT couldn't fully drive.
Eublet: For my tone goals, when I was using the VT as the sole preamp, running the drive control at 9 was about the maximum I liked to use. Any more than that and the added harmonic content started pushing the upper-mids too far forward for my taste, even with the character knob turned off. If you were using a Crown XLS Drivecore, which has 1.4V input sensitivity, and kept the drive control down like I preferred (if I recall correctly, JimmyM uses his with the drive control turned off completely), you might run out of gas at the front end of the power amp. Using something with 1.0V or lower input sensitivity would allow you to use whatever settings you wanted on the VT and still have enough output with just the level control to get the job done. This is important with this pedal given how interactive everything is with one another. Also, please keep in mind that this is purely speculative on my end as all I've done is compare the output spec of the VT to the input spec of the XLS drivecore. I was not able to try this combination out in the real world, which might tell a wildly different story than the specs.
Eublet: For my tone goals, when I was using the VT as the sole preamp, running the drive control at 9 was about the maximum I liked to use. Any more than that and the added harmonic content started pushing the upper-mids too far forward for my taste, even with the character knob turned off. If you were using a Crown XLS Drivecore, which has 1.4V input sensitivity, and kept the drive control down like I preferred (if I recall correctly, JimmyM uses his with the drive control turned off completely), you might run out of gas at the front end of the power amp. Using something with 1.0V or lower input sensitivity would allow you to use whatever settings you wanted on the VT and still have enough output with just the level control to get the job done. This is important with this pedal given how interactive everything is with one another. Also, please keep in mind that this is purely speculative on my end as all I've done is compare the output spec of the VT to the input spec of the XLS drivecore. I was not able to try this combination out in the real world, which might tell a wildly different story than the specs.