Beautiful trippy wonderland!!
Do your thing and enter these alter states of consciousness on your own terms. It's completely subjective. I don't have any problem with combos. I just see it as another state of consciousness. I like to explore the all the trippy wonderlands. But what I find pleasing someone else may find unpleasant.
I enjoy taking higher doses of LSD and shrooms as I want the full effect of the experience. I don't want to tip my toes in the water. I want to be submerged. Many people do not like the higher dose experience and stick with a mellow trip. Each to their own. Ingesting LSD and then ingesting DMT is exploring my mind. Just another doorway, another hallway, another perspective. I add all my experiences with both ordinary states of consciousness and altered states of consciousness together like puzzle pieces and attempt to solve my own jigsaw puzzle.
I understand wanting to take DMT or any psychedelic in a pure manor. Having respect for these tools is vital for any true personal growth to take place. Don't forget to have a little fun too. These tools can bring you into a child like state. Sometimes it's just nice to be in that state and relax. We set up all these rules in our head and can over complicate things pretty fast.
It sounds like you may be contemplating using DMT while on LSD. Maybe one day you will be sitting there tripping out in your own wonderland and that idea will pop in your head. It will seem like such a good idea. You will smile and try it. Maybe not. But the mind can change. What feels wrong today may feel just fine a year from now. It's a long strange trip through many strange and beautiful trippy wonderlands. See as many as them as you wish or none at all.
You don't have to ingest anything. Life is trippy and beautiful in it's own right. Take some time and think about it. Do it when your ready. Don't force it. It should be a relaxed thing as much as possible.
Not sure if this helps or confounds things further.
Go with your gut. Follow your instincts.
"In the universe there is an immeasurable, indescribable force which shamans call intent, and absolutely everything that exists in the entire cosmos is attached to intent by a connecting link." ~Carlos Castaneda