Tuning can always be handled later. Focus on the relative tuning (how valuable X skill is compared to Y, as would affect MCH's available rotations) first. Also, Rook has never been a "group DoT"; it's only ever been single-target.
Since Shadowbringers, nearly all pet commands have required a prior caster animation. To this day they also still remain poorly responsive. If this would follow suit, costing us weave-space and delaying pet actions to still thoughtlessly hammer out additional pet keys while Queen is out (to at best do what we already did with the pet behaving on its unvarying script), I doubt you'll find every MCH lining up for this.2. make the Queen a pet with manual ability use. having more direct control over the queen and having it out permanently would be something every mechanist would get behind.
For manual activation to make sense, it would have to be among the outliers that have no caster animation ICD outside of the initial summon and must have multiple choices of varying optimal rotation (else it would include no more decision-making than did merely summoning the thing and letting it DoT away).
As above, this would essentially turn Queen into just another (Hypercharged) Gauss Shot spam, except now we'd also be even more constrained in at what timings we could Queen, since we'd want the duration to end after having just finished a combo, so long as that wouldn't desync us from raid buffs.3. change battery gauge to a second resource to use queen abilities. have her abilities be a 123 combo costing X amount of battery gauge to use (single button rotation like continuation is might help with bar clutter).
Detonation uses no additional key and costs us nothing. At most, have it no longer use a caster animation so that it actuates sooner and doesn't cost us weave space.4. remove detonation. its always been a clunky move and can reworked into something more functional maybe even a damage buff for either party or the Queen. putting the queen into overdrive would be a cool mechanic to have as a lvl 90.
So, just swap the lv90 and lv86 abilities? But why?5. move chainsaw further down the lvl unlock to make the lvl 90 ability the Queen Overdrive/overload.