Sounds groovy to me. Particularly the migration away from Bootstrap a'la v3. 👍
And no worries about the slippage. Technical Debt has always been a thing, long before the moniker. ROSS (Real Open Source Software) history is full of examples of foreseen real world problems tossing wrenches into the works of even the most carefully considered and crafted roadmaps.
Rock on! 🎸