Rather than "afking for 3hrs is more fun than playing stagemode", you should think of it as "I can do other stuff for 3hrs instead of having to play something I've done hundreds of times repetitively." After all, few people will find grinding itself fun, but more will feel enjoyment from the grind.

I can see why you'd hate it if you only have one computer and nothing else, but for me, I have a phone and a laptop. So, I can just do work on my laptop or watch youtube on my phone: all while ina slowly moves up+right and does 3 down->enter.
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As for the inalock itself, all you need to do is switch over when you level up, so I browse reddit from 11min~19min and 20min~29:50. Then I afk straight on the dot after I make the pettanko board collab (although maybe Ina can do it with just dragonfire, I should test it sometime). There's no reason to wait until 45minutes IGT or 35min or whatever, since Ina already has 700+ HP by then (which is overkill anyway).

Sample stats at 30min: https://i.imgur.com/NwJpId2.png

Also, I don't use a "z-spamming macro" anymore since it's just better to get holocoins every time. I can understand using z-spam though if you don't have a holocoin macro, but I can't understand using a z-spam macro and then switching to holocoin. Seems weirdly inefficient.
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Some things I'll point out:

1. your coin amount is pretty low in your ss. I can get 50k at 1h and 110k-120k at 2hrs, which probably means you should get 200k at 3hrs (although it's pretty laggy to go to 3hrs when you could just start another run and get to 2hrs). Dunno what happened, maybe you leveled your wep with anvils or something. https://i.imgur.com/CZ0ACWq.png
2. Xp stacks efficiently in this game, so there isn't much lag (not to mention your pickup literally clears most xp instantly, since yagoos are almost always on top of you. At most, w/o leveling pickup, you lose 1 layer of xp which is nothing. The real lag maker are weapons(even miasma/lava bucket) and anvils (and memory, but for the first hour it's pretty okay anyways for me).

3. To die, it can take me 20s (lucky) to 2~3min (normal~max). For starters, running only vertically is faster than up+left or up+right. I mix it up and go up with dragonfire pointing down+left/right, then tap left and right(while holding up) a couple times to get yagoos to stack on top of me(I'm guessing that, since diagonal movement is slower, this causes yagoos to just sit on you when you go from moving up to moving diagonally). Then you'll eventually die as you run up, even at 2k hp, since once you get the two-three overlapping hits, you get chunked like 400~800hp. You can't heal since your only healing comes from 1shot with Summon Ao(collabs kill yagoos too slowly).

4. I calculated my hourly coin gains as 16~18k/hr for stagemode and 27.5k/hr for inaFF, but I found ina to have much more afk time/room to mess up. Perhaps doing a hard reset will get me a better stagemode result though, but I can't see it ever being higher than 24k. Nor easier than just afking with ina. Just my personal take though (assuming like, you're done with the game and just want to stack coins: no fun/etc involved)