I have a DXEngineering fast taper MBVE-1 which is made of 3' tubing sections. I thought of replacing two or even more sections with 6' sections. That might require a stronger base and surely a set of guys or two.
Like you, I have clutter nearby. I figured that a taller vertical would be slightly less lossy on 80 and 160. Above all a 50-55' vertical would better clear nearby homes including my own and tall trees about 150' away. Bandwidth would improve. Increasing the height would cost little, especially if I replaced thin top sections rather than the costly 2" diameter bottom sections.
My question, posed on Eham a few weeks ago, was where to add the length, top or bottom, to make the strongest vertical. There was some agreement that replacing bottom sections was the way to go.
Of course, lengthening the radiator beyond about 43' would destroy the vertical's low angle performance on 20 meters. But the telescoping sections could be easily shortened to return the antenna to an ideal length for 20 meters (about 39' to 43' according to my modeling)
I see that ZeroFive is now selling a 50' vertical advertised for 160-30 meters. I don't know how the taper is handled on that antenna.
With your nice concrete base, you might consider trying a 50' tall "43 footer."