Accelerating NATO membership during a military conflict would be inadvisable and not realistic:
1) NATO has specific requirements for membership that must be achieved prior to acceptance
2) Sweden and Finland have been NATO partners for decades and have applied for accelerated membership and are still awaiting final approval by the NATO members
3) NATO membership is subject to approval of all 30 members, including Viktor Orban's Hungary
4) NATO's leader has publicly committed to the resupply of Ukraine's military for the duration of the conflict which does not need Hungary's approval
5) The Ukrainian military is doing a fine job without NATO troops and they deserve all the accolades even though they are using mostly Soviet Era military equipment
6) Direct NATO involvement would trigger massive Russian mobilization prolonging the conflict and validate the Putin's propaganda paranoia that this is a secret war against the Russian people. Thereby unifying the Russian population. Remember to divide, then conquer.
7) Despite Putin's pre-invasion ultimatums, if Ukraine prevails in the war they will ultimately become either a NATO member or will host the largest US military base outside the USA. Both scenarios are a nightmare for hardcore Russian Imperialists.
8) Direct military involvement by NATO at this stage would be seen as an existential threat to Russia and might provoke a nuclear war. Everyone loses.
9) A slower collapse of the Russian military allows for a power struggle within the Kremlin to play out. This is already occurring as evidenced by the frequent untimely deaths among Oligarchs. Some Oligarchs have private armies of mercenaries all vying for power in a post-Putin Kremlin. Better not to "unify" them. Then watch as the Russian Federation disintegrates.
Allow cooler heads to prevail. The strategy seems to be working. NATO and the USA are preparing for any possible Russian action with an appropriate and devastating response. After all, that is the entire purpose of NATO.